diff --git a/CHANGELOG.md b/CHANGELOG.md
index ecdef33..6611155 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,7 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/).
 ## [3.3.0] - 2021-05-14
 
 ### Changed
-- Allow PyLangAcq v0.14.*, adding the new features of the `filter` method to `CHATReader`
+- Allow PyLangAcq v0.14.*, thereby adding the new features of the `filter` method to `CHATReader`
   and optional parallelization for CHAT data processing.
 
 ### Fixed
diff --git a/docs/.buildinfo b/docs/.buildinfo
index ab8d418..5e317e7 100644
--- a/docs/.buildinfo
+++ b/docs/.buildinfo
@@ -1,4 +1,4 @@
 # Sphinx build info version 1
 # This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done.
-config: bcaf27e0daa67b087c97e3d5b2f4ee49
+config: cee6def581e35a17a1b21f5f9bc28b2d
 tags: 645f666f9bcd5a90fca523b33c5a78b7
diff --git a/docs/_modules/index.html b/docs/_modules/index.html
index 477f839..8e0e261 100644
--- a/docs/_modules/index.html
+++ b/docs/_modules/index.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Overview: module code &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>Overview: module code &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -64,7 +64,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -171,77 +171,82 @@
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 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id11">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id25">Changed</a><ul>
 <li class="toctree-l4"><a class="reference internal" href="../changelog.html#api-breaking-changes">API-breaking Changes</a></li>
 <li class="toctree-l4"><a class="reference internal" href="../changelog.html#non-api-breaking-changes">Non-API-breaking Changes</a></li>
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 </li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="../archives.html">Archives</a><ul>
@@ -334,7 +339,7 @@ <h1>All modules for which code is available</h1>
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/_modules/pycantonese/corpus.html b/docs/_modules/pycantonese/corpus.html
index e710218..2c172a9 100644
--- a/docs/_modules/pycantonese/corpus.html
+++ b/docs/_modules/pycantonese/corpus.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pycantonese.corpus &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.corpus &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -64,7 +64,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -171,77 +171,82 @@
 <li class="toctree-l3"><a class="reference internal" href="../../changelog.html#security">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id11">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id25">Changed</a><ul>
 <li class="toctree-l4"><a class="reference internal" href="../../changelog.html#api-breaking-changes">API-breaking Changes</a></li>
 <li class="toctree-l4"><a class="reference internal" href="../../changelog.html#non-api-breaking-changes">Non-API-breaking Changes</a></li>
 </ul>
 </li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id48">[0.2] - 2015-01-22</a></li>
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@@ -727,7 +732,7 @@ <h1>Source code for pycantonese.corpus</h1><div class="highlight"><pre>
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/_modules/pycantonese/jyutping/characters.html b/docs/_modules/pycantonese/jyutping/characters.html
index 03e5afd..95796b7 100644
--- a/docs/_modules/pycantonese/jyutping/characters.html
+++ b/docs/_modules/pycantonese/jyutping/characters.html
@@ -7,7 +7,7 @@
   
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-  <title>pycantonese.jyutping.characters &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.jyutping.characters &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -64,7 +64,7 @@
             
             
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+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id26">Deprecated</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id49">[0.1] - 2014-12-17</a></li>
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@@ -455,7 +460,7 @@ <h1>Source code for pycantonese.jyutping.characters</h1><div class="highlight"><
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/_modules/pycantonese/jyutping/parse_jyutping.html b/docs/_modules/pycantonese/jyutping/parse_jyutping.html
index 3a5e760..7ee0207 100644
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+++ b/docs/_modules/pycantonese/jyutping/parse_jyutping.html
@@ -7,7 +7,7 @@
   
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-  <title>pycantonese.jyutping.parse_jyutping &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.jyutping.parse_jyutping &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -64,7 +64,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
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@@ -171,77 +171,82 @@
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id3">Changed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
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+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id16">Deprecated</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id22">Changed</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id26">Deprecated</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id36">Added</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
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 <li class="toctree-l1"><a class="reference internal" href="../../../archives.html">Archives</a><ul>
@@ -515,7 +520,7 @@ <h1>Source code for pycantonese.jyutping.parse_jyutping</h1><div class="highligh
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/_modules/pycantonese/jyutping/tipa.html b/docs/_modules/pycantonese/jyutping/tipa.html
index 169b095..1b5c7cd 100644
--- a/docs/_modules/pycantonese/jyutping/tipa.html
+++ b/docs/_modules/pycantonese/jyutping/tipa.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pycantonese.jyutping.tipa &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.jyutping.tipa &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -64,7 +64,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -171,77 +171,82 @@
 <li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#security">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id12">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id17">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id25">Changed</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id27">Security</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id29">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="../../../archives.html">Archives</a><ul>
@@ -464,7 +469,7 @@ <h1>Source code for pycantonese.jyutping.tipa</h1><div class="highlight"><pre>
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/_modules/pycantonese/jyutping/yale.html b/docs/_modules/pycantonese/jyutping/yale.html
index 112cce5..3b5f7a1 100644
--- a/docs/_modules/pycantonese/jyutping/yale.html
+++ b/docs/_modules/pycantonese/jyutping/yale.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pycantonese.jyutping.yale &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.jyutping.yale &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -64,7 +64,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -171,77 +171,82 @@
 <li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#security">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id25">Changed</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id29">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id31">Added</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id34">Removed</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="../../../archives.html">Archives</a><ul>
@@ -642,7 +647,7 @@ <h1>Source code for pycantonese.jyutping.yale</h1><div class="highlight"><pre>
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/_modules/pycantonese/pos_tagging/hkcancor_to_ud.html b/docs/_modules/pycantonese/pos_tagging/hkcancor_to_ud.html
index 4f9b033..9cbbce9 100644
--- a/docs/_modules/pycantonese/pos_tagging/hkcancor_to_ud.html
+++ b/docs/_modules/pycantonese/pos_tagging/hkcancor_to_ud.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pycantonese.pos_tagging.hkcancor_to_ud &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.pos_tagging.hkcancor_to_ud &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -64,7 +64,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -171,77 +171,82 @@
 <li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#security">Security</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id4">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id8">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id10">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id12">Fixed</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id17">Fixed</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id25">Changed</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="../../../archives.html">Archives</a><ul>
@@ -509,7 +514,7 @@ <h1>Source code for pycantonese.pos_tagging.hkcancor_to_ud</h1><div class="highl
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/_modules/pycantonese/pos_tagging/tagger.html b/docs/_modules/pycantonese/pos_tagging/tagger.html
index d1943cd..917965e 100644
--- a/docs/_modules/pycantonese/pos_tagging/tagger.html
+++ b/docs/_modules/pycantonese/pos_tagging/tagger.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pycantonese.pos_tagging.tagger &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.pos_tagging.tagger &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -64,7 +64,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -171,77 +171,82 @@
 <li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#security">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id11">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id25">Changed</a><ul>
 <li class="toctree-l4"><a class="reference internal" href="../../../changelog.html#api-breaking-changes">API-breaking Changes</a></li>
 <li class="toctree-l4"><a class="reference internal" href="../../../changelog.html#non-api-breaking-changes">Non-API-breaking Changes</a></li>
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 </li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id26">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../../changelog.html#id38">Added</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id46">[1.0] - 2015-09-06</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../../changelog.html#id49">[0.1] - 2014-12-17</a></li>
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@@ -677,7 +682,7 @@ <h1>Source code for pycantonese.pos_tagging.tagger</h1><div class="highlight"><p
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/_modules/pycantonese/stop_words.html b/docs/_modules/pycantonese/stop_words.html
index 272ddf0..47f0ff3 100644
--- a/docs/_modules/pycantonese/stop_words.html
+++ b/docs/_modules/pycantonese/stop_words.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pycantonese.stop_words &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.stop_words &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -64,7 +64,7 @@
             
             
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-                3.2.4
+                3.3.0
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-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id3">Changed</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id16">Deprecated</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id26">Deprecated</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id39">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id49">[0.1] - 2014-12-17</a></li>
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@@ -482,7 +487,7 @@ <h1>Source code for pycantonese.stop_words</h1><div class="highlight"><pre>
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/_modules/pycantonese/word_segmentation.html b/docs/_modules/pycantonese/word_segmentation.html
index 3e62a02..205d8ab 100644
--- a/docs/_modules/pycantonese/word_segmentation.html
+++ b/docs/_modules/pycantonese/word_segmentation.html
@@ -7,7 +7,7 @@
   
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-  <title>pycantonese.word_segmentation &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.word_segmentation &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -64,7 +64,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
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@@ -171,77 +171,82 @@
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-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id3">Changed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id17">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id24">Added</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id27">Security</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id29">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id31">Added</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="../../archives.html">Archives</a><ul>
@@ -443,7 +448,7 @@ <h1>Source code for pycantonese.word_segmentation</h1><div class="highlight"><pr
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/_modules/pylangacq/chat.html b/docs/_modules/pylangacq/chat.html
index 6e05972..d8e2036 100644
--- a/docs/_modules/pylangacq/chat.html
+++ b/docs/_modules/pylangacq/chat.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pylangacq.chat &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pylangacq.chat &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -64,7 +64,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -171,77 +171,82 @@
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id4">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id6">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id8">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id10">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id12">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id17">Fixed</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id25">Changed</a><ul>
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 </li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id27">Security</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="../../archives.html">Archives</a><ul>
@@ -1731,7 +1736,7 @@ <h1>Source code for pylangacq.chat</h1><div class="highlight"><pre>
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/_sources/changelog.rst.txt b/docs/_sources/changelog.rst.txt
index f26a590..c5e35d6 100644
--- a/docs/_sources/changelog.rst.txt
+++ b/docs/_sources/changelog.rst.txt
@@ -24,6 +24,22 @@ Fixed
 Security
 ^^^^^^^^
 
+[3.3.0] - 2021-05-14
+--------------------
+
+Changed
+^^^^^^^
+
+
+* Allow PyLangAcq v0.14.*, thereby adding the new features of the ``filter`` method to ``CHATReader``
+  and optional parallelization for CHAT data processing.
+
+Fixed
+^^^^^
+
+
+* Fixed the ``search`` method of ``CHATReader`` when ``by_tokens`` is ``False``.
+
 [3.2.4] - 2021-05-07
 --------------------
 
diff --git a/docs/_static/documentation_options.js b/docs/_static/documentation_options.js
index 79de40e..f1eeddc 100644
--- a/docs/_static/documentation_options.js
+++ b/docs/_static/documentation_options.js
@@ -1,6 +1,6 @@
 var DOCUMENTATION_OPTIONS = {
     URL_ROOT: document.getElementById("documentation_options").getAttribute('data-url_root'),
-    VERSION: '3.2.4',
+    VERSION: '3.3.0',
     LANGUAGE: 'None',
     COLLAPSE_INDEX: false,
     BUILDER: 'html',
diff --git a/docs/api.html b/docs/api.html
index 7af2cc4..38c1283 100644
--- a/docs/api.html
+++ b/docs/api.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>API Reference &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>API Reference &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -173,77 +173,82 @@
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#security">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id25">Changed</a><ul>
 <li class="toctree-l4"><a class="reference internal" href="changelog.html#api-breaking-changes">API-breaking Changes</a></li>
 <li class="toctree-l4"><a class="reference internal" href="changelog.html#non-api-breaking-changes">Non-API-breaking Changes</a></li>
 </ul>
 </li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="archives.html">Archives</a><ul>
@@ -397,7 +402,7 @@ <h2><a class="reference internal" href="generated/pycantonese.CHATReader.html#py
 <div class="admonition note">
 <p class="admonition-title">Note</p>
 <p>Some of the methods are inherited from the parent class
-<a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.13.3)"><code class="xref py py-class docutils literal notranslate"><span class="pre">Reader</span></code></a> for language acquisition,
+<a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.14.0)"><code class="xref py py-class docutils literal notranslate"><span class="pre">Reader</span></code></a> for language acquisition,
 which may or may not be applicable to your use case.</p>
 </div>
 <p class="rubric">Methods</p>
@@ -742,7 +747,7 @@ <h2><a class="reference internal" href="generated/pycantonese.CHATReader.html#py
 </dd>
 <dt class="field-even">Returns</dt>
 <dd class="field-even"><dl class="simple">
-<dt><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.13.3)"><code class="xref py py-class docutils literal notranslate"><span class="pre">pylangacq.Reader</span></code></a></dt><dd></dd>
+<dt><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.14.0)"><code class="xref py py-class docutils literal notranslate"><span class="pre">pylangacq.Reader</span></code></a></dt><dd></dd>
 </dl>
 </dd>
 </dl>
@@ -778,7 +783,7 @@ <h2><a class="reference internal" href="generated/pycantonese.CHATReader.html#py
 </dd>
 <dt class="field-even">Returns</dt>
 <dd class="field-even"><dl class="simple">
-<dt><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.13.3)"><code class="xref py py-class docutils literal notranslate"><span class="pre">pylangacq.Reader</span></code></a></dt><dd></dd>
+<dt><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.14.0)"><code class="xref py py-class docutils literal notranslate"><span class="pre">pylangacq.Reader</span></code></a></dt><dd></dd>
 </dl>
 </dd>
 </dl>
@@ -802,7 +807,7 @@ <h2><a class="reference internal" href="generated/pycantonese.CHATReader.html#py
 </dd>
 <dt class="field-even">Returns</dt>
 <dd class="field-even"><dl class="simple">
-<dt><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.13.3)"><code class="xref py py-class docutils literal notranslate"><span class="pre">pylangacq.Reader</span></code></a></dt><dd></dd>
+<dt><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.14.0)"><code class="xref py py-class docutils literal notranslate"><span class="pre">pylangacq.Reader</span></code></a></dt><dd></dd>
 </dl>
 </dd>
 </dl>
@@ -846,7 +851,7 @@ <h2><a class="reference internal" href="generated/pycantonese.CHATReader.html#py
 </dd>
 <dt class="field-even">Returns</dt>
 <dd class="field-even"><dl class="simple">
-<dt><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.13.3)"><code class="xref py py-class docutils literal notranslate"><span class="pre">pylangacq.Reader</span></code></a></dt><dd></dd>
+<dt><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.14.0)"><code class="xref py py-class docutils literal notranslate"><span class="pre">pylangacq.Reader</span></code></a></dt><dd></dd>
 </dl>
 </dd>
 </dl>
@@ -1043,7 +1048,7 @@ <h2><a class="reference internal" href="generated/pycantonese.CHATReader.html#py
 <dl class="field-list simple">
 <dt class="field-odd">Returns</dt>
 <dd class="field-odd"><dl class="simple">
-<dt><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.13.3)"><code class="xref py py-class docutils literal notranslate"><span class="pre">pylangacq.Reader</span></code></a></dt><dd></dd>
+<dt><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.14.0)"><code class="xref py py-class docutils literal notranslate"><span class="pre">pylangacq.Reader</span></code></a></dt><dd></dd>
 </dl>
 </dd>
 </dl>
@@ -1056,7 +1061,7 @@ <h2><a class="reference internal" href="generated/pycantonese.CHATReader.html#py
 <dl class="field-list simple">
 <dt class="field-odd">Returns</dt>
 <dd class="field-odd"><dl class="simple">
-<dt><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.13.3)"><code class="xref py py-class docutils literal notranslate"><span class="pre">pylangacq.Reader</span></code></a></dt><dd></dd>
+<dt><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.14.0)"><code class="xref py py-class docutils literal notranslate"><span class="pre">pylangacq.Reader</span></code></a></dt><dd></dd>
 </dl>
 </dd>
 </dl>
@@ -1180,7 +1185,7 @@ <h2><a class="reference internal" href="generated/pycantonese.CHATReader.html#py
 
 <dl class="py method">
 <dt id="pycantonese.CHATReader.tagged_sents">
-<code class="sig-name descname">tagged_sents</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">participants</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">exclude</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">by_files</span><span class="o">=</span><span class="default_value">False</span></em><span class="sig-paren">)</span> &#x2192; Union<span class="p">[</span>List<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Token" title="(in PyLangAcq v0.13.3)">pylangacq.objects.Token</a><span class="p">]</span><span class="p">]</span><span class="p">, </span>List<span class="p">[</span>List<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Token" title="(in PyLangAcq v0.13.3)">pylangacq.objects.Token</a><span class="p">]</span><span class="p">]</span><span class="p">]</span><span class="p">]</span><a class="headerlink" href="#pycantonese.CHATReader.tagged_sents" title="Permalink to this definition">¶</a></dt>
+<code class="sig-name descname">tagged_sents</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">participants</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">exclude</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">by_files</span><span class="o">=</span><span class="default_value">False</span></em><span class="sig-paren">)</span> &#x2192; Union<span class="p">[</span>List<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Token" title="(in PyLangAcq v0.14.0)">pylangacq.objects.Token</a><span class="p">]</span><span class="p">]</span><span class="p">, </span>List<span class="p">[</span>List<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Token" title="(in PyLangAcq v0.14.0)">pylangacq.objects.Token</a><span class="p">]</span><span class="p">]</span><span class="p">]</span><span class="p">]</span><a class="headerlink" href="#pycantonese.CHATReader.tagged_sents" title="Permalink to this definition">¶</a></dt>
 <dd><p>Return the tagged sents.</p>
 <div class="deprecated">
 <p><span class="versionmodified deprecated">Deprecated since version 0.13.0: </span>Please use <code class="xref py py-func docutils literal notranslate"><span class="pre">tokens()</span></code> with <code class="docutils literal notranslate"><span class="pre">by_utterances=True</span></code>
@@ -1223,7 +1228,7 @@ <h2><a class="reference internal" href="generated/pycantonese.CHATReader.html#py
 
 <dl class="py method">
 <dt id="pycantonese.CHATReader.tagged_words">
-<code class="sig-name descname">tagged_words</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">participants</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">exclude</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">by_files</span><span class="o">=</span><span class="default_value">False</span></em><span class="sig-paren">)</span> &#x2192; Union<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Token" title="(in PyLangAcq v0.13.3)">pylangacq.objects.Token</a><span class="p">]</span><span class="p">, </span>List<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Token" title="(in PyLangAcq v0.13.3)">pylangacq.objects.Token</a><span class="p">]</span><span class="p">]</span><span class="p">]</span><a class="headerlink" href="#pycantonese.CHATReader.tagged_words" title="Permalink to this definition">¶</a></dt>
+<code class="sig-name descname">tagged_words</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">participants</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">exclude</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">by_files</span><span class="o">=</span><span class="default_value">False</span></em><span class="sig-paren">)</span> &#x2192; Union<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Token" title="(in PyLangAcq v0.14.0)">pylangacq.objects.Token</a><span class="p">]</span><span class="p">, </span>List<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Token" title="(in PyLangAcq v0.14.0)">pylangacq.objects.Token</a><span class="p">]</span><span class="p">]</span><span class="p">]</span><a class="headerlink" href="#pycantonese.CHATReader.tagged_words" title="Permalink to this definition">¶</a></dt>
 <dd><p>Return the tagged words.</p>
 <div class="deprecated">
 <p><span class="versionmodified deprecated">Deprecated since version 0.13.0: </span>Please use <code class="xref py py-func docutils literal notranslate"><span class="pre">tokens()</span></code> with <code class="docutils literal notranslate"><span class="pre">by_utterances=False</span></code>
@@ -1265,7 +1270,7 @@ <h2><a class="reference internal" href="generated/pycantonese.CHATReader.html#py
 
 <dl class="py method">
 <dt id="pycantonese.CHATReader.tokens">
-<code class="sig-name descname">tokens</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">participants</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">exclude</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">by_utterances</span><span class="o">=</span><span class="default_value">False</span></em>, <em class="sig-param"><span class="n">by_files</span><span class="o">=</span><span class="default_value">False</span></em><span class="sig-paren">)</span> &#x2192; Union<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Token" title="(in PyLangAcq v0.13.3)">pylangacq.objects.Token</a><span class="p">]</span><span class="p">, </span>List<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Token" title="(in PyLangAcq v0.13.3)">pylangacq.objects.Token</a><span class="p">]</span><span class="p">]</span><span class="p">, </span>List<span class="p">[</span>List<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Token" title="(in PyLangAcq v0.13.3)">pylangacq.objects.Token</a><span class="p">]</span><span class="p">]</span><span class="p">]</span><span class="p">]</span><a class="headerlink" href="#pycantonese.CHATReader.tokens" title="Permalink to this definition">¶</a></dt>
+<code class="sig-name descname">tokens</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">participants</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">exclude</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">by_utterances</span><span class="o">=</span><span class="default_value">False</span></em>, <em class="sig-param"><span class="n">by_files</span><span class="o">=</span><span class="default_value">False</span></em><span class="sig-paren">)</span> &#x2192; Union<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Token" title="(in PyLangAcq v0.14.0)">pylangacq.objects.Token</a><span class="p">]</span><span class="p">, </span>List<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Token" title="(in PyLangAcq v0.14.0)">pylangacq.objects.Token</a><span class="p">]</span><span class="p">]</span><span class="p">, </span>List<span class="p">[</span>List<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Token" title="(in PyLangAcq v0.14.0)">pylangacq.objects.Token</a><span class="p">]</span><span class="p">]</span><span class="p">]</span><span class="p">]</span><a class="headerlink" href="#pycantonese.CHATReader.tokens" title="Permalink to this definition">¶</a></dt>
 <dd><p>Return the tokens.</p>
 <dl class="field-list simple">
 <dt class="field-odd">Parameters</dt>
@@ -1340,7 +1345,7 @@ <h2><a class="reference internal" href="generated/pycantonese.CHATReader.html#py
 
 <dl class="py method">
 <dt id="pycantonese.CHATReader.utterances">
-<code class="sig-name descname">utterances</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">participants</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">exclude</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">by_files</span><span class="o">=</span><span class="default_value">False</span></em><span class="sig-paren">)</span> &#x2192; Union<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Utterance" title="(in PyLangAcq v0.13.3)">pylangacq.objects.Utterance</a><span class="p">]</span><span class="p">, </span>List<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Utterance" title="(in PyLangAcq v0.13.3)">pylangacq.objects.Utterance</a><span class="p">]</span><span class="p">]</span><span class="p">]</span><a class="headerlink" href="#pycantonese.CHATReader.utterances" title="Permalink to this definition">¶</a></dt>
+<code class="sig-name descname">utterances</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">participants</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">exclude</span><span class="o">=</span><span class="default_value">None</span></em>, <em class="sig-param"><span class="n">by_files</span><span class="o">=</span><span class="default_value">False</span></em><span class="sig-paren">)</span> &#x2192; Union<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Utterance" title="(in PyLangAcq v0.14.0)">pylangacq.objects.Utterance</a><span class="p">]</span><span class="p">, </span>List<span class="p">[</span>List<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Utterance" title="(in PyLangAcq v0.14.0)">pylangacq.objects.Utterance</a><span class="p">]</span><span class="p">]</span><span class="p">]</span><a class="headerlink" href="#pycantonese.CHATReader.utterances" title="Permalink to this definition">¶</a></dt>
 <dd><p>Return the utterances.</p>
 <dl class="field-list simple">
 <dt class="field-odd">Parameters</dt>
@@ -1525,7 +1530,7 @@ <h2><a class="reference internal" href="generated/pycantonese.CHATReader.html#py
 <h2><a class="reference internal" href="#pycantonese.corpus.Token" title="pycantonese.corpus.Token"><code class="xref py py-class docutils literal notranslate"><span class="pre">Token</span></code></a><a class="headerlink" href="#token" title="Permalink to this headline">¶</a></h2>
 <dl class="py class">
 <dt id="pycantonese.corpus.Token">
-<em class="property">class </em><code class="sig-prename descclassname">pycantonese.corpus.</code><code class="sig-name descname">Token</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">word</span><span class="p">:</span> <span class="n"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.9)">str</a></span></em>, <em class="sig-param"><span class="n">pos</span><span class="p">:</span> <span class="n">Optional<span class="p">[</span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.9)">str</a><span class="p">]</span></span></em>, <em class="sig-param"><span class="n">jyutping</span><span class="p">:</span> <span class="n">Optional<span class="p">[</span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.9)">str</a><span class="p">]</span></span></em>, <em class="sig-param"><span class="n">mor</span><span class="p">:</span> <span class="n">Optional<span class="p">[</span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.9)">str</a><span class="p">]</span></span></em>, <em class="sig-param"><span class="n">gra</span><span class="p">:</span> <span class="n">Optional<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Gra" title="(in PyLangAcq v0.13.3)">pylangacq.objects.Gra</a><span class="p">]</span></span></em><span class="sig-paren">)</span><a class="reference internal" href="_modules/pycantonese/corpus.html#Token"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pycantonese.corpus.Token" title="Permalink to this definition">¶</a></dt>
+<em class="property">class </em><code class="sig-prename descclassname">pycantonese.corpus.</code><code class="sig-name descname">Token</code><span class="sig-paren">(</span><em class="sig-param"><span class="n">word</span><span class="p">:</span> <span class="n"><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.9)">str</a></span></em>, <em class="sig-param"><span class="n">pos</span><span class="p">:</span> <span class="n">Optional<span class="p">[</span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.9)">str</a><span class="p">]</span></span></em>, <em class="sig-param"><span class="n">jyutping</span><span class="p">:</span> <span class="n">Optional<span class="p">[</span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.9)">str</a><span class="p">]</span></span></em>, <em class="sig-param"><span class="n">mor</span><span class="p">:</span> <span class="n">Optional<span class="p">[</span><a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#str" title="(in Python v3.9)">str</a><span class="p">]</span></span></em>, <em class="sig-param"><span class="n">gra</span><span class="p">:</span> <span class="n">Optional<span class="p">[</span><a class="reference external" href="https://pylangacq.org/api.html#pylangacq.objects.Gra" title="(in PyLangAcq v0.14.0)">pylangacq.objects.Gra</a><span class="p">]</span></span></em><span class="sig-paren">)</span><a class="reference internal" href="_modules/pycantonese/corpus.html#Token"><span class="viewcode-link">[source]</span></a><a class="headerlink" href="#pycantonese.corpus.Token" title="Permalink to this definition">¶</a></dt>
 <dd><p>Token with attributes as parsed from a CHAT utterance.</p>
 <dl class="field-list simple">
 <dt class="field-odd">Attributes</dt>
@@ -1604,7 +1609,7 @@ <h2><a class="reference internal" href="#pycantonese.jyutping.Jyutping" title="p
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/archives.html b/docs/archives.html
index eb07791..e2285a8 100644
--- a/docs/archives.html
+++ b/docs/archives.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Archives &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>Archives &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -65,7 +65,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -172,77 +172,82 @@
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#security">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id11">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id25">Changed</a><ul>
 <li class="toctree-l4"><a class="reference internal" href="changelog.html#api-breaking-changes">API-breaking Changes</a></li>
 <li class="toctree-l4"><a class="reference internal" href="changelog.html#non-api-breaking-changes">Non-API-breaking Changes</a></li>
 </ul>
 </li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1 current"><a class="current reference internal" href="#">Archives</a><ul>
@@ -353,7 +358,7 @@ <h2>Tutorials<a class="headerlink" href="#tutorials" title="Permalink to this he
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/changelog.html b/docs/changelog.html
index 69c6753..30b982c 100644
--- a/docs/changelog.html
+++ b/docs/changelog.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Changelog &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>Changelog &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -173,77 +173,82 @@
 <li class="toctree-l3"><a class="reference internal" href="#security">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id10">[3.2.0] - 2021-03-20</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id11">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id25">Changed</a><ul>
 <li class="toctree-l4"><a class="reference internal" href="#api-breaking-changes">API-breaking Changes</a></li>
 <li class="toctree-l4"><a class="reference internal" href="#non-api-breaking-changes">Non-API-breaking Changes</a></li>
 </ul>
 </li>
-<li class="toctree-l3"><a class="reference internal" href="#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="archives.html">Archives</a><ul>
@@ -338,9 +343,25 @@ <h3>Security<a class="headerlink" href="#security" title="Permalink to this head
 </div>
 </div>
 <div class="section" id="id2">
-<h2>[3.2.4] - 2021-05-07<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h2>
+<h2>[3.3.0] - 2021-05-14<a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h2>
 <div class="section" id="id3">
-<h3>Fixed<a class="headerlink" href="#id3" title="Permalink to this headline">¶</a></h3>
+<h3>Changed<a class="headerlink" href="#id3" title="Permalink to this headline">¶</a></h3>
+<ul class="simple">
+<li><p>Allow PyLangAcq v0.14.*, thereby adding the new features of the <code class="docutils literal notranslate"><span class="pre">filter</span></code> method to <code class="docutils literal notranslate"><span class="pre">CHATReader</span></code>
+and optional parallelization for CHAT data processing.</p></li>
+</ul>
+</div>
+<div class="section" id="id4">
+<h3>Fixed<a class="headerlink" href="#id4" title="Permalink to this headline">¶</a></h3>
+<ul class="simple">
+<li><p>Fixed the <code class="docutils literal notranslate"><span class="pre">search</span></code> method of <code class="docutils literal notranslate"><span class="pre">CHATReader</span></code> when <code class="docutils literal notranslate"><span class="pre">by_tokens</span></code> is <code class="docutils literal notranslate"><span class="pre">False</span></code>.</p></li>
+</ul>
+</div>
+</div>
+<div class="section" id="id5">
+<h2>[3.2.4] - 2021-05-07<a class="headerlink" href="#id5" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id6">
+<h3>Fixed<a class="headerlink" href="#id6" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Fixed the previously inoperational methods <code class="docutils literal notranslate"><span class="pre">append</span></code>, <code class="docutils literal notranslate"><span class="pre">append_left</span></code>, <code class="docutils literal notranslate"><span class="pre">extend</span></code>, and <code class="docutils literal notranslate"><span class="pre">extend_left</span></code>
 of the class <code class="docutils literal notranslate"><span class="pre">CHATReader</span></code> through the upstream PyLangAcq package.</p></li>
@@ -350,57 +371,57 @@ <h3>Fixed<a class="headerlink" href="#id3" title="Permalink to this headline">¶
 </ul>
 </div>
 </div>
-<div class="section" id="id4">
-<h2>[3.2.3] - 2021-04-12<a class="headerlink" href="#id4" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id5">
-<h3>Fixed<a class="headerlink" href="#id5" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id7">
+<h2>[3.2.3] - 2021-04-12<a class="headerlink" href="#id7" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id8">
+<h3>Fixed<a class="headerlink" href="#id8" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Fixed character issues in the built-in HKCanCor data: 𥄫</p></li>
 </ul>
 </div>
 </div>
-<div class="section" id="id6">
-<h2>[3.2.2] - 2021-03-23<a class="headerlink" href="#id6" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id7">
-<h3>Fixed<a class="headerlink" href="#id7" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id9">
+<h2>[3.2.2] - 2021-03-23<a class="headerlink" href="#id9" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id10">
+<h3>Fixed<a class="headerlink" href="#id10" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Fixed a CHAT parsing issue when correction and repetition are combined,
 by bumping the pylangacq dependency from v0.13.0 to v0.13.1.</p></li>
 </ul>
 </div>
 </div>
-<div class="section" id="id8">
-<h2>[3.2.1] - 2021-03-21<a class="headerlink" href="#id8" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id9">
-<h3>Fixed<a class="headerlink" href="#id9" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id11">
+<h2>[3.2.1] - 2021-03-21<a class="headerlink" href="#id11" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id12">
+<h3>Fixed<a class="headerlink" href="#id12" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Fixed character issues in the built-in HKCanCor data: 𠮩𠹌, 𠻗</p></li>
 </ul>
 </div>
 </div>
-<div class="section" id="id10">
-<h2>[3.2.0] - 2021-03-20<a class="headerlink" href="#id10" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id13">
+<h2>[3.2.0] - 2021-03-20<a class="headerlink" href="#id13" title="Permalink to this headline">¶</a></h2>
 <p>Note: The underlying CHAT parser, the PyLangAcq package, has been bumped to v0.13.0.
 All of the updates of PyLangAcq’s CHAT reader apply to this PyCantonese release
 as well. The details are in
 <a class="reference external" href="https://github.com/jacksonllee/pylangacq/releases/tag/v0.13.0">PyLangAcq’s changelog for v0.13.0</a>.
 The changelog entries below only document updates specific to PyCantonese.</p>
-<div class="section" id="id11">
-<h3>Added<a class="headerlink" href="#id11" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id14">
+<h3>Added<a class="headerlink" href="#id14" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Defined the <code class="docutils literal notranslate"><span class="pre">Jyutping</span></code> class to better represent parsed Jyutping romanization.</p></li>
 </ul>
 </div>
-<div class="section" id="id12">
-<h3>Changed<a class="headerlink" href="#id12" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id15">
+<h3>Changed<a class="headerlink" href="#id15" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Bumped the PyLangAcq dependency to v0.13.0.</p></li>
 <li><p>The function <code class="docutils literal notranslate"><span class="pre">parse_jyutping</span></code> now returns a list of <code class="docutils literal notranslate"><span class="pre">Jyutping</span></code> objects,
 rather than tuples of strings.</p></li>
 </ul>
 </div>
-<div class="section" id="id13">
-<h3>Deprecated<a class="headerlink" href="#id13" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id16">
+<h3>Deprecated<a class="headerlink" href="#id16" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>The following methods in the <code class="docutils literal notranslate"><span class="pre">CHATReader</span></code> class have been deprecated:</p>
 <ul>
@@ -417,26 +438,26 @@ <h3>Deprecated<a class="headerlink" href="#id13" title="Permalink to this headli
 </li>
 </ul>
 </div>
-<div class="section" id="id14">
-<h3>Fixed<a class="headerlink" href="#id14" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id17">
+<h3>Fixed<a class="headerlink" href="#id17" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Fixed the character issues in the built-in HKCanCor data: 𠺢, 𠺝, 𡁜, 𧕴, 𥊙, 𡃓, 𠴕, 𡀔</p></li>
 </ul>
 </div>
 </div>
-<div class="section" id="id15">
-<h2>[3.1.1] - 2021-03-18<a class="headerlink" href="#id15" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id16">
-<h3>Fixed<a class="headerlink" href="#id16" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id18">
+<h2>[3.1.1] - 2021-03-18<a class="headerlink" href="#id18" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id19">
+<h3>Fixed<a class="headerlink" href="#id19" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Pinned pylangacq at 0.12.0 (the new 0.13.0 has breaking changes).</p></li>
 </ul>
 </div>
 </div>
-<div class="section" id="id17">
-<h2>[3.1.0] - 2021-02-21<a class="headerlink" href="#id17" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id18">
-<h3>Added<a class="headerlink" href="#id18" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id20">
+<h2>[3.1.0] - 2021-02-21<a class="headerlink" href="#id20" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id21">
+<h3>Added<a class="headerlink" href="#id21" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Part-of-speech tagging:</p>
 <ul>
@@ -455,8 +476,8 @@ <h3>Added<a class="headerlink" href="#id18" title="Permalink to this headline">
 <li><p>The test suite now covers code snippets in both the docstrings and <code class="docutils literal notranslate"><span class="pre">.rst</span></code> doc files.</p></li>
 </ul>
 </div>
-<div class="section" id="id19">
-<h3>Fixed<a class="headerlink" href="#id19" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id22">
+<h3>Fixed<a class="headerlink" href="#id22" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Fixed the issue of not opening text files with UTF-8 encoding
 (a possible issue on Windows).</p></li>
@@ -467,10 +488,10 @@ <h3>Fixed<a class="headerlink" href="#id19" title="Permalink to this headline">
 </ul>
 </div>
 </div>
-<div class="section" id="id20">
-<h2>[3.0.0] - 2020-10-25<a class="headerlink" href="#id20" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id21">
-<h3>Added<a class="headerlink" href="#id21" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id23">
+<h2>[3.0.0] - 2020-10-25<a class="headerlink" href="#id23" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id24">
+<h3>Added<a class="headerlink" href="#id24" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Word segmentation:</p>
 <ul>
@@ -501,8 +522,8 @@ <h3>Added<a class="headerlink" href="#id21" title="Permalink to this headline">
 <li><p>Added support for Python 3.9.</p></li>
 </ul>
 </div>
-<div class="section" id="id22">
-<h3>Changed<a class="headerlink" href="#id22" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id25">
+<h3>Changed<a class="headerlink" href="#id25" title="Permalink to this headline">¶</a></h3>
 <div class="section" id="api-breaking-changes">
 <h4>API-breaking Changes<a class="headerlink" href="#api-breaking-changes" title="Permalink to this headline">¶</a></h4>
 <ul class="simple">
@@ -523,8 +544,8 @@ <h4>Non-API-breaking Changes<a class="headerlink" href="#non-api-breaking-change
 </ul>
 </div>
 </div>
-<div class="section" id="id23">
-<h3>Deprecated<a class="headerlink" href="#id23" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id26">
+<h3>Deprecated<a class="headerlink" href="#id26" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>The following <code class="docutils literal notranslate"><span class="pre">x2y</span></code> functions have been deprecated in favor of their
 equivalents named in the form of <code class="docutils literal notranslate"><span class="pre">x_to_y</span></code>.</p>
@@ -536,27 +557,27 @@ <h3>Deprecated<a class="headerlink" href="#id23" title="Permalink to this headli
 </li>
 </ul>
 </div>
-<div class="section" id="id24">
-<h3>Security<a class="headerlink" href="#id24" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id27">
+<h3>Security<a class="headerlink" href="#id27" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Turned on HTTPS for the pycantonese.org domain.</p></li>
 </ul>
 </div>
 </div>
-<div class="section" id="id25">
-<h2>[2.4.1] - 2020-10-10<a class="headerlink" href="#id25" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id26">
-<h3>Fixed<a class="headerlink" href="#id26" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id28">
+<h2>[2.4.1] - 2020-10-10<a class="headerlink" href="#id28" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id29">
+<h3>Fixed<a class="headerlink" href="#id29" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Switched to the <code class="docutils literal notranslate"><span class="pre">wordseg</span></code> dependency to a PyPI source instead of a
 GitHub direct link.</p></li>
 </ul>
 </div>
 </div>
-<div class="section" id="id27">
-<h2>[2.4.0] - 2020-10-10<a class="headerlink" href="#id27" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id28">
-<h3>Added<a class="headerlink" href="#id28" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id30">
+<h2>[2.4.0] - 2020-10-10<a class="headerlink" href="#id30" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id31">
+<h3>Added<a class="headerlink" href="#id31" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Added the <code class="docutils literal notranslate"><span class="pre">characters2jyutping()</span></code> function for converting
 Cantonese characters to Jyutping romanization.</p></li>
@@ -564,50 +585,50 @@ <h3>Added<a class="headerlink" href="#id28" title="Permalink to this headline">
 </ul>
 </div>
 </div>
-<div class="section" id="id29">
-<h2>[2.3.0] - 2020-07-24<a class="headerlink" href="#id29" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id30">
-<h3>Added<a class="headerlink" href="#id30" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id32">
+<h2>[2.3.0] - 2020-07-24<a class="headerlink" href="#id32" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id33">
+<h3>Added<a class="headerlink" href="#id33" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Added support for Python 3.7 and 3.8.</p></li>
 </ul>
 </div>
-<div class="section" id="id31">
-<h3>Removed<a class="headerlink" href="#id31" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id34">
+<h3>Removed<a class="headerlink" href="#id34" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Dropped support for Python 3.4 and 3.5 (supporting 3.6, 3.7, and 3.8 now).</p></li>
 </ul>
 </div>
 </div>
-<div class="section" id="id32">
-<h2>[2.2.0] - 2018-06-30<a class="headerlink" href="#id32" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id33">
-<h3>Added<a class="headerlink" href="#id33" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id35">
+<h2>[2.2.0] - 2018-06-30<a class="headerlink" href="#id35" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id36">
+<h3>Added<a class="headerlink" href="#id36" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>104 stop words.</p></li>
 </ul>
 </div>
 </div>
-<div class="section" id="id34">
-<h2>[2.1.0] - 2018-06-11<a class="headerlink" href="#id34" title="Permalink to this headline">¶</a></h2>
-<div class="section" id="id35">
-<h3>Added<a class="headerlink" href="#id35" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id37">
+<h2>[2.1.0] - 2018-06-11<a class="headerlink" href="#id37" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id38">
+<h3>Added<a class="headerlink" href="#id38" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Exposed the <code class="docutils literal notranslate"><span class="pre">exclude</span></code> parameter in various reader methods
 for excluding specific participants. This parameter was implemented at
 pylangacq v0.10.0.</p></li>
 </ul>
 </div>
-<div class="section" id="id36">
-<h3>Fixed<a class="headerlink" href="#id36" title="Permalink to this headline">¶</a></h3>
+<div class="section" id="id39">
+<h3>Fixed<a class="headerlink" href="#id39" title="Permalink to this headline">¶</a></h3>
 <ul class="simple">
 <li><p>Allowed “n” to be a syllabic nasal.</p></li>
 <li><p>Fixed corpus reader not picking up the characters.</p></li>
 </ul>
 </div>
 </div>
-<div class="section" id="id37">
-<h2>[2.0.0] - 2016-02-06<a class="headerlink" href="#id37" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id40">
+<h2>[2.0.0] - 2016-02-06<a class="headerlink" href="#id40" title="Permalink to this headline">¶</a></h2>
 <ul class="simple">
 <li><p>PyCantonese now requires Python 3.4 or above.</p></li>
 <li><p>Adopted the CHAT corpus format, piggybacking on <a class="reference external" href="http://pylangacq.org/">PyLangAcq</a></p></li>
@@ -621,8 +642,8 @@ <h2>[2.0.0] - 2016-02-06<a class="headerlink" href="#id37" title="Permalink to t
 <a class="reference external" href="https://github.com/pycantonese/pycantonese/issues/9">#9</a></p></li>
 </ul>
 </div>
-<div class="section" id="id43">
-<h2>[1.0] - 2015-09-06<a class="headerlink" href="#id43" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id46">
+<h2>[1.0] - 2015-09-06<a class="headerlink" href="#id46" title="Permalink to this headline">¶</a></h2>
 <ul class="simple">
 <li><p>Fixed the Jyutping-Yale conversion issue with “yu”</p></li>
 <li><p>Added <code class="docutils literal notranslate"><span class="pre">number_of_words()</span></code> and <code class="docutils literal notranslate"><span class="pre">number_of_characters()</span></code> for corpus access</p></li>
@@ -643,22 +664,22 @@ <h2>[1.0dev] - 2015-09-02<a class="headerlink" href="#dev-2015-09-02" title="Per
 <li><p>Disabled the function for reading a custom corpus dataset (it will come back)</p></li>
 </ul>
 </div>
-<div class="section" id="id44">
-<h2>[0.2.1] - 2015-01-25<a class="headerlink" href="#id44" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id47">
+<h2>[0.2.1] - 2015-01-25<a class="headerlink" href="#id47" title="Permalink to this headline">¶</a></h2>
 <ul class="simple">
 <li><p>Fixed corpus access path issues</p></li>
 </ul>
 </div>
-<div class="section" id="id45">
-<h2>[0.2] - 2015-01-22<a class="headerlink" href="#id45" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id48">
+<h2>[0.2] - 2015-01-22<a class="headerlink" href="#id48" title="Permalink to this headline">¶</a></h2>
 <ul class="simple">
 <li><p><a class="reference external" href="http://compling.hss.ntu.edu.sg/hkcancor/">The Hong Kong Cantonese Corpus</a> is included in the package.</p></li>
 <li><p>A general-purpose <code class="docutils literal notranslate"><span class="pre">search()</span></code> function is defined, replacing the
 element-specific search functions from version 0.1.</p></li>
 </ul>
 </div>
-<div class="section" id="id46">
-<h2>[0.1] - 2014-12-17<a class="headerlink" href="#id46" title="Permalink to this headline">¶</a></h2>
+<div class="section" id="id49">
+<h2>[0.1] - 2014-12-17<a class="headerlink" href="#id49" title="Permalink to this headline">¶</a></h2>
 <ul class="simple">
 <li><p>Basic functions available, including…</p></li>
 <li><p>Parsing Jyutping romanization</p></li>
@@ -690,7 +711,7 @@ <h2>[0.1] - 2014-12-17<a class="headerlink" href="#id46" title="Permalink to thi
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/data.html b/docs/data.html
index 7db9120..a7a8258 100644
--- a/docs/data.html
+++ b/docs/data.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Corpus Data &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>Corpus Data &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -173,77 +173,82 @@
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#security">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id11">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id25">Changed</a><ul>
 <li class="toctree-l4"><a class="reference internal" href="changelog.html#api-breaking-changes">API-breaking Changes</a></li>
 <li class="toctree-l4"><a class="reference internal" href="changelog.html#non-api-breaking-changes">Non-API-breaking Changes</a></li>
 </ul>
 </li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="archives.html">Archives</a><ul>
@@ -495,7 +500,7 @@ <h2>Custom Data<a class="headerlink" href="#custom-data" title="Permalink to thi
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/generated/pycantonese.CHATReader.html b/docs/generated/pycantonese.CHATReader.html
index 6fa0bd5..65d0ebf 100644
--- a/docs/generated/pycantonese.CHATReader.html
+++ b/docs/generated/pycantonese.CHATReader.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pycantonese.CHATReader &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.CHATReader &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -173,77 +173,82 @@
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#security">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id11">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id25">Changed</a><ul>
 <li class="toctree-l4"><a class="reference internal" href="../changelog.html#api-breaking-changes">API-breaking Changes</a></li>
 <li class="toctree-l4"><a class="reference internal" href="../changelog.html#non-api-breaking-changes">Non-API-breaking Changes</a></li>
 </ul>
 </li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="../archives.html">Archives</a><ul>
@@ -325,7 +330,7 @@ <h1>pycantonese.CHATReader<a class="headerlink" href="#pycantonese-chatreader" t
 <div class="admonition note">
 <p class="admonition-title">Note</p>
 <p>Some of the methods are inherited from the parent class
-<a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.13.3)"><code class="xref py py-class docutils literal notranslate"><span class="pre">Reader</span></code></a> for language acquisition,
+<a class="reference external" href="https://pylangacq.org/api.html#pylangacq.Reader" title="(in PyLangAcq v0.14.0)"><code class="xref py py-class docutils literal notranslate"><span class="pre">Reader</span></code></a> for language acquisition,
 which may or may not be applicable to your use case.</p>
 </div>
 <p class="rubric">Methods</p>
@@ -610,7 +615,7 @@ <h1>pycantonese.CHATReader<a class="headerlink" href="#pycantonese-chatreader" t
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/generated/pycantonese.CHATReader.search.html b/docs/generated/pycantonese.CHATReader.search.html
index 59be6fc..1d1ce2f 100644
--- a/docs/generated/pycantonese.CHATReader.search.html
+++ b/docs/generated/pycantonese.CHATReader.search.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pycantonese.CHATReader.search &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.CHATReader.search &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -173,77 +173,82 @@
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#security">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id11">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id25">Changed</a><ul>
 <li class="toctree-l4"><a class="reference internal" href="../changelog.html#api-breaking-changes">API-breaking Changes</a></li>
 <li class="toctree-l4"><a class="reference internal" href="../changelog.html#non-api-breaking-changes">Non-API-breaking Changes</a></li>
 </ul>
 </li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="../archives.html">Archives</a><ul>
@@ -417,7 +422,7 @@ <h1>pycantonese.CHATReader.search<a class="headerlink" href="#pycantonese-chatre
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/generated/pycantonese.characters_to_jyutping.html b/docs/generated/pycantonese.characters_to_jyutping.html
index 6401bac..9e206eb 100644
--- a/docs/generated/pycantonese.characters_to_jyutping.html
+++ b/docs/generated/pycantonese.characters_to_jyutping.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pycantonese.characters_to_jyutping &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.characters_to_jyutping &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -173,77 +173,82 @@
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#security">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id11">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id27">Security</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id34">Removed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Added</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
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 <li class="toctree-l1"><a class="reference internal" href="../archives.html">Archives</a><ul>
@@ -380,7 +385,7 @@ <h1>pycantonese.characters_to_jyutping<a class="headerlink" href="#pycantonese-c
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/generated/pycantonese.hkcancor.html b/docs/generated/pycantonese.hkcancor.html
index e781131..552f775 100644
--- a/docs/generated/pycantonese.hkcancor.html
+++ b/docs/generated/pycantonese.hkcancor.html
@@ -7,7 +7,7 @@
   
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-  <title>pycantonese.hkcancor &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.hkcancor &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
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-                3.2.4
+                3.3.0
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@@ -173,77 +173,82 @@
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id4">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id8">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id10">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id25">Changed</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="../archives.html">Archives</a><ul>
@@ -354,7 +359,7 @@ <h1>pycantonese.hkcancor<a class="headerlink" href="#pycantonese-hkcancor" title
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/generated/pycantonese.jyutping_to_tipa.html b/docs/generated/pycantonese.jyutping_to_tipa.html
index 1eb5ead..0a049e1 100644
--- a/docs/generated/pycantonese.jyutping_to_tipa.html
+++ b/docs/generated/pycantonese.jyutping_to_tipa.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pycantonese.jyutping_to_tipa &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.jyutping_to_tipa &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -173,77 +173,82 @@
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#security">Security</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Deprecated</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id25">Changed</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id27">Security</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id49">[0.1] - 2014-12-17</a></li>
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@@ -375,7 +380,7 @@ <h1>pycantonese.jyutping_to_tipa<a class="headerlink" href="#pycantonese-jyutpin
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/generated/pycantonese.jyutping_to_yale.html b/docs/generated/pycantonese.jyutping_to_yale.html
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@@ -7,7 +7,7 @@
   
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-  <title>pycantonese.jyutping_to_yale &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.jyutping_to_yale &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
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@@ -173,77 +173,82 @@
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id4">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id6">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id8">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id10">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id25">Changed</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id27">Security</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id29">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Added</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
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@@ -391,7 +396,7 @@ <h1>pycantonese.jyutping_to_yale<a class="headerlink" href="#pycantonese-jyutpin
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
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-  <title>pycantonese.parse_jyutping &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.parse_jyutping &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
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@@ -173,77 +173,82 @@
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id10">Fixed</a></li>
 </ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id17">Fixed</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id25">Changed</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id27">Security</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id29">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Added</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id34">Removed</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="../archives.html">Archives</a><ul>
@@ -374,7 +379,7 @@ <h1>pycantonese.parse_jyutping<a class="headerlink" href="#pycantonese-parse-jyu
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/generated/pycantonese.pos_tag.html b/docs/generated/pycantonese.pos_tag.html
index 33a758f..927e76d 100644
--- a/docs/generated/pycantonese.pos_tag.html
+++ b/docs/generated/pycantonese.pos_tag.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pycantonese.pos_tag &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.pos_tag &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
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@@ -173,77 +173,82 @@
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 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id11">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id25">Changed</a><ul>
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 </li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="../archives.html">Archives</a><ul>
@@ -399,7 +404,7 @@ <h1>pycantonese.pos_tag<a class="headerlink" href="#pycantonese-pos-tag" title="
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/generated/pycantonese.pos_tagging.hkcancor_to_ud.html b/docs/generated/pycantonese.pos_tagging.hkcancor_to_ud.html
index 4d9cc18..7c54058 100644
--- a/docs/generated/pycantonese.pos_tagging.hkcancor_to_ud.html
+++ b/docs/generated/pycantonese.pos_tagging.hkcancor_to_ud.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pycantonese.pos_tagging.hkcancor_to_ud &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.pos_tagging.hkcancor_to_ud &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -173,77 +173,82 @@
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#security">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id7">Fixed</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Deprecated</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Changed</a><ul>
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+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id27">Security</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Added</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id49">[0.1] - 2014-12-17</a></li>
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@@ -380,7 +385,7 @@ <h1>pycantonese.pos_tagging.hkcancor_to_ud<a class="headerlink" href="#pycantone
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/generated/pycantonese.read_chat.html b/docs/generated/pycantonese.read_chat.html
index de26332..d634a74 100644
--- a/docs/generated/pycantonese.read_chat.html
+++ b/docs/generated/pycantonese.read_chat.html
@@ -7,7 +7,7 @@
   
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-  <title>pycantonese.read_chat &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.read_chat &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
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+                3.3.0
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@@ -173,77 +173,82 @@
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id4">Fixed</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id8">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id10">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id17">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id25">Changed</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id27">Security</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id29">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Added</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
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@@ -383,7 +388,7 @@ <h1>pycantonese.read_chat<a class="headerlink" href="#pycantonese-read-chat" tit
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/generated/pycantonese.segment.html b/docs/generated/pycantonese.segment.html
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--- a/docs/generated/pycantonese.segment.html
+++ b/docs/generated/pycantonese.segment.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pycantonese.segment &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.segment &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
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@@ -173,77 +173,82 @@
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Changed</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Fixed</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Deprecated</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Added</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id49">[0.1] - 2014-12-17</a></li>
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@@ -387,7 +392,7 @@ <h1>pycantonese.segment<a class="headerlink" href="#pycantonese-segment" title="
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/generated/pycantonese.stop_words.html b/docs/generated/pycantonese.stop_words.html
index e263670..2295e06 100644
--- a/docs/generated/pycantonese.stop_words.html
+++ b/docs/generated/pycantonese.stop_words.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>pycantonese.stop_words &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.stop_words &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
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-                3.2.4
+                3.3.0
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@@ -173,77 +173,82 @@
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id4">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id10">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id12">Fixed</a></li>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id17">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id25">Changed</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id27">Security</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id29">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
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@@ -381,7 +386,7 @@ <h1>pycantonese.stop_words<a class="headerlink" href="#pycantonese-stop-words" t
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/generated/pycantonese.word_segmentation.Segmenter.html b/docs/generated/pycantonese.word_segmentation.Segmenter.html
index 8eb9aba..c67cc88 100644
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+++ b/docs/generated/pycantonese.word_segmentation.Segmenter.html
@@ -7,7 +7,7 @@
   
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-  <title>pycantonese.word_segmentation.Segmenter &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>pycantonese.word_segmentation.Segmenter &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
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+                3.3.0
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@@ -173,77 +173,82 @@
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id6">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id8">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id10">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id17">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="../changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id25">Changed</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id29">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="../changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="../changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="../changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="../archives.html">Archives</a><ul>
@@ -401,7 +406,7 @@ <h1>pycantonese.word_segmentation.Segmenter<a class="headerlink" href="#pycanton
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/genindex.html b/docs/genindex.html
index b4c98f1..746315a 100644
--- a/docs/genindex.html
+++ b/docs/genindex.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Index &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>Index &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -64,7 +64,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -171,77 +171,82 @@
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#security">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id11">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id25">Changed</a><ul>
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 </li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="archives.html">Archives</a><ul>
@@ -587,7 +592,7 @@ <h2 id="W">W</h2>
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/index.html b/docs/index.html
index c777021..2ea74d9 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -9,7 +9,7 @@
 
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>PyCantonese: Cantonese Linguistics and NLP in Python &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>PyCantonese: Cantonese Linguistics and NLP in Python &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -67,7 +67,7 @@
             
             
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-                3.2.4
+                3.3.0
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Changed</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
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+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Deprecated</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Deprecated</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Added</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
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 <li class="toctree-l1"><a class="reference internal" href="archives.html">Archives</a><ul>
@@ -448,7 +453,7 @@ <h2>Table of Contents<a class="headerlink" href="#table-of-contents" title="Perm
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/jyutping.html b/docs/jyutping.html
index e7836e3..a04e300 100644
--- a/docs/jyutping.html
+++ b/docs/jyutping.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Jyutping Romanization &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>Jyutping Romanization &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
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@@ -173,77 +173,82 @@
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Changed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id10">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Deprecated</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Changed</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id27">Security</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id34">Removed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Added</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id39">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id49">[0.1] - 2014-12-17</a></li>
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@@ -488,7 +493,7 @@ <h2>Jyutping-to-TIPA Conversion<a class="headerlink" href="#jyutping-to-tipa-con
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/objects.inv b/docs/objects.inv
index d8972df..0d8c9d3 100644
Binary files a/docs/objects.inv and b/docs/objects.inv differ
diff --git a/docs/pos_tagging.html b/docs/pos_tagging.html
index 7c3954b..426a5f0 100644
--- a/docs/pos_tagging.html
+++ b/docs/pos_tagging.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Part-of-Speech Tagging &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>Part-of-Speech Tagging &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
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+                3.3.0
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id27">Security</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id34">Removed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Added</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id39">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[1.0] - 2015-09-06</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id49">[0.1] - 2014-12-17</a></li>
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@@ -383,7 +388,7 @@
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/quickstart.html b/docs/quickstart.html
index e3acfe3..702d12b 100644
--- a/docs/quickstart.html
+++ b/docs/quickstart.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Quickstart &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>Quickstart &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -173,77 +173,82 @@
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id4">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id17">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id25">Changed</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id27">Security</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id34">Removed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Added</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id43">[1.0] - 2015-09-06</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id48">[0.2] - 2015-01-22</a></li>
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@@ -394,7 +399,7 @@
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
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diff --git a/docs/reader.html b/docs/reader.html
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@@ -7,7 +7,7 @@
   
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-  <title>Corpus Reader Methods &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>Corpus Reader Methods &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
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+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Deprecated</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Added</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id39">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[1.0] - 2015-09-06</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id49">[0.1] - 2014-12-17</a></li>
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@@ -608,7 +613,7 @@ <h2>Word Frequencies and Ngrams<a class="headerlink" href="#word-frequencies-and
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/search.html b/docs/search.html
index b986c8f..3eb5989 100644
--- a/docs/search.html
+++ b/docs/search.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Search &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>Search &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
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@@ -173,77 +173,82 @@
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id4">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id8">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id10">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id17">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id25">Changed</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id27">Security</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id34">Removed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Added</a></li>
 </ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id49">[0.1] - 2014-12-17</a></li>
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 <li class="toctree-l1"><a class="reference internal" href="archives.html">Archives</a><ul>
@@ -338,7 +343,7 @@
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/searches.html b/docs/searches.html
index 564fa73..2e4467f 100644
--- a/docs/searches.html
+++ b/docs/searches.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Corpus Search Queries &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>Corpus Search Queries &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
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@@ -173,77 +173,82 @@
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#security">Security</a></li>
 </ul>
 </li>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id4">Fixed</a></li>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id6">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id25">Changed</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
 </li>
 <li class="toctree-l1"><a class="reference internal" href="archives.html">Archives</a><ul>
@@ -601,7 +606,7 @@
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/searchindex.js b/docs/searchindex.js
index 2d24bf1..be764c1 100644
--- a/docs/searchindex.js
+++ b/docs/searchindex.js
@@ -1 +1 @@
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Reference","Archives","Changelog","Corpus Data","pycantonese.CHATReader","pycantonese.CHATReader.search","pycantonese.characters_to_jyutping","pycantonese.hkcancor","pycantonese.jyutping_to_tipa","pycantonese.jyutping_to_yale","pycantonese.parse_jyutping","pycantonese.pos_tag","pycantonese.pos_tagging.hkcancor_to_ud","pycantonese.read_chat","pycantonese.segment","pycantonese.stop_words","pycantonese.word_segmentation.Segmenter","PyCantonese: Cantonese Linguistics and NLP in Python","Jyutping Romanization","Part-of-Speech Tagging","Quickstart","Corpus Reader Methods","Corpus Search Queries","Stop Words","Word Segmentation"],titleterms:{"0dev":2,"2014":2,"2015":2,"2016":2,"2018":2,"2020":2,"2021":2,"break":2,Added:2,acknowledg:17,annot:21,api:[0,2],archiv:1,built:3,cantones:17,chang:2,changelog:2,charact:[18,21,22],characters_to_jyutp:6,chat:3,chatread:[0,4,5],child:3,chines:[21,22],cite:17,consult:17,content:17,convers:18,corpu:[0,3,21,22],criteria:22,custom:[3,24],data:[0,3],deprec:2,download:17,element:22,exampl:[],fix:2,format:[3,22],frequenc:21,header:21,hkcancor:7,hkcancor_to_ud:12,how:17,instal:17,jyutp:[0,18,21,22],jyutping_to_tipa:8,jyutping_to_yal:9,languag:0,licens:17,linguist:17,link:17,logo:17,method:21,multipl:22,natur:0,ngram:21,nlp:17,non:2,output:[1,22],pars:18,parse_jyutp:10,part:[19,22],pos_tag:[11,12],process:0,pycantones:[4,5,6,7,8,9,10,11,12,13,14,15,16,17],python:17,queri:22,quick:[],quickstart:20,rang:22,read_chat:13,reader:21,refer:0,remov:2,research:1,result:22,roman:[0,18,21],search:[5,22],secur:2,segment:[14,16,24],speech:[19,22],stop:23,stop_word:15,string:18,support:17,tabl:17,tag:[19,22],talkbank:3,tipa:18,token:0,transcript:21,tutori:1,unreleas:2,utter:22,word:[21,22,23,24],word_segment:16,yale:18}})
\ No newline at end of file
diff --git a/docs/source/changelog.rst b/docs/source/changelog.rst
index f26a590..c5e35d6 100644
--- a/docs/source/changelog.rst
+++ b/docs/source/changelog.rst
@@ -24,6 +24,22 @@ Fixed
 Security
 ^^^^^^^^
 
+[3.3.0] - 2021-05-14
+--------------------
+
+Changed
+^^^^^^^
+
+
+* Allow PyLangAcq v0.14.*, thereby adding the new features of the ``filter`` method to ``CHATReader``
+  and optional parallelization for CHAT data processing.
+
+Fixed
+^^^^^
+
+
+* Fixed the ``search`` method of ``CHATReader`` when ``by_tokens`` is ``False``.
+
 [3.2.4] - 2021-05-07
 --------------------
 
diff --git a/docs/stop_words.html b/docs/stop_words.html
index 9c9cfdd..10aa138 100644
--- a/docs/stop_words.html
+++ b/docs/stop_words.html
@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Stop Words &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>Stop Words &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
               <div class="version">
-                3.2.4
+                3.3.0
               </div>
             
           
@@ -173,77 +173,82 @@
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#security">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.2.4] - 2021-05-07</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id4">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id4">[3.2.3] - 2021-04-12</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id5">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id6">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id6">[3.2.2] - 2021-03-23</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id7">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id8">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id10">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id11">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Changed</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id17">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#id19">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Added</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id39">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[1.0] - 2015-09-06</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id49">[0.1] - 2014-12-17</a></li>
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@@ -373,7 +378,7 @@
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>
diff --git a/docs/word_segmentation.html b/docs/word_segmentation.html
index f244611..6c7077f 100644
--- a/docs/word_segmentation.html
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@@ -7,7 +7,7 @@
   
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   
-  <title>Word Segmentation &mdash; PyCantonese 3.2.4 documentation</title>
+  <title>Word Segmentation &mdash; PyCantonese 3.3.0 documentation</title>
   
 
   
@@ -66,7 +66,7 @@
             
             
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+                3.3.0
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id2">[3.3.0] - 2021-05-14</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id3">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id4">Fixed</a></li>
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+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id5">[3.2.4] - 2021-05-07</a><ul>
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+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id7">[3.2.3] - 2021-04-12</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id8">[3.2.1] - 2021-03-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id9">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id9">[3.2.2] - 2021-03-23</a><ul>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id10">[3.2.0] - 2021-03-20</a><ul>
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-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id13">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id11">[3.2.1] - 2021-03-21</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id12">Fixed</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id15">[3.1.1] - 2021-03-18</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id13">[3.2.0] - 2021-03-20</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id14">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id15">Changed</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id16">Deprecated</a></li>
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-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id17">[3.1.0] - 2021-02-21</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id18">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id18">[3.1.1] - 2021-03-18</a><ul>
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 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id20">[3.1.0] - 2021-02-21</a><ul>
 <li class="toctree-l3"><a class="reference internal" href="changelog.html#id21">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Changed</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id22">Fixed</a></li>
+</ul>
+</li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id23">[3.0.0] - 2020-10-25</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id25">Changed</a><ul>
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 </li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id23">Deprecated</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id24">Security</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Deprecated</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id27">Security</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id25">[2.4.1] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id26">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id28">[2.4.1] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id29">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id27">[2.4.0] - 2020-10-10</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id28">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id30">[2.4.0] - 2020-10-10</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id29">[2.3.0] - 2020-07-24</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id30">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id31">Removed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.3.0] - 2020-07-24</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id34">Removed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id32">[2.2.0] - 2018-06-30</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id33">Added</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id35">[2.2.0] - 2018-06-30</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Added</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id34">[2.1.0] - 2018-06-11</a><ul>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id35">Added</a></li>
-<li class="toctree-l3"><a class="reference internal" href="changelog.html#id36">Fixed</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.1.0] - 2018-06-11</a><ul>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id38">Added</a></li>
+<li class="toctree-l3"><a class="reference internal" href="changelog.html#id39">Fixed</a></li>
 </ul>
 </li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id37">[2.0.0] - 2016-02-06</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id43">[1.0] - 2015-09-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id40">[2.0.0] - 2016-02-06</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[1.0] - 2015-09-06</a></li>
 <li class="toctree-l2"><a class="reference internal" href="changelog.html#dev-2015-09-02">[1.0dev] - 2015-09-02</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id44">[0.2.1] - 2015-01-25</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id45">[0.2] - 2015-01-22</a></li>
-<li class="toctree-l2"><a class="reference internal" href="changelog.html#id46">[0.1] - 2014-12-17</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id47">[0.2.1] - 2015-01-25</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id48">[0.2] - 2015-01-22</a></li>
+<li class="toctree-l2"><a class="reference internal" href="changelog.html#id49">[0.1] - 2014-12-17</a></li>
 </ul>
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@@ -410,7 +415,7 @@ <h2>Customizing Segmentation<a class="headerlink" href="#customizing-segmentatio
   <div role="contentinfo">
     <p>
         
-        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 07, 2021
+        &copy; Copyright 2014-2021, Jackson L. Lee | Documentation last updated on May 14, 2021
 
     </p>
   </div>