Strange results in datalog computation

[bertram-gil]

On the master branch (6d427d9), on the following datalog file, I am getting strange results:

Z 64

in(A:Z) input
out(A:Z) printtuples

in(43).
in(33).

out(a) :- in(a), in(a), in(a).

I should just be getting 43 and 33. right? But I am getting:

Tuples in out: 
	(A=43(0))
	(A=33(1))
	(A=2(2))
	(A=3(3))
	(A=4(4))
	(A=5(5))
	(A=6(6))
	(A=7(7))
	(A=8(8))
	(A=9(9))
	(A=10(10))
	(A=11(11))
	(A=12(12))
	(A=13(13))
	(A=14(14))
	(A=15(15))
	(A=16(16))
	(A=17(17))
	(A=18(18))
	(A=19(19))
	(A=20(20))
	(A=21(21))
	(A=22(22))
	(A=23(23))
	(A=24(24))
	(A=25(25))
	(A=26(26))
	(A=27(27))
	(A=28(28))
	(A=29(29))
	(A=30(30))
	(A=31(31))
	(A=32(32))
	(A=33(33))
	(A=34(34))
	(A=35(35))
	(A=36(36))
	(A=37(37))
	(A=38(38))
	(A=39(39))
	(A=40(40))
	(A=41(41))
	(A=42(42))
	(A=43(43))
	(A=44(44))
	(A=45(45))
	(A=46(46))
	(A=47(47))
	(A=48(48))
	(A=49(49))
	(A=50(50))
	(A=51(51))
	(A=52(52))
	(A=53(53))
	(A=54(54))
	(A=55(55))
	(A=56(56))
	(A=57(57))
	(A=58(58))
	(A=59(59))
	(A=60(60))
	(A=61(61))
	(A=62(62))
	(A=63(63))
Time: 3ms
Parsing: 0ms, other: 2ms