Make me a window. I'll give you a number (N). You return a window.
Rules:
The window will always be 2 x 2.
The window needs to have N number of periods across and N number of periods vertically in each pane.
Example:
N = 3
---------
|...|...|
|...|...|
|...|...|
|---+---|
|...|...|
|...|...|
|...|...|
---------
Note: there should be no trailing new line characters at the end.