Change history of SetOps, Emptiness

Rev	Date	Modified by	Minor edit	Spam	WikiText	Revert to
4	2011-05-07 09:49:58	dkf	no	no	4	4
3	2011-05-01 22:58:02	RLE	no	no	3	3
2	2007-02-06 19:54:39	134.243.50.190	no	no	2	2
1	1999-11-19 08:47:14	192.109.213.3	no	no	1	1
0	1999-03-24 15:46:14	194.77.26.150	no	no	0	0