Change history of SetOps, Symmetrical difference

Rev	Date	Modified by	Minor edit	Spam	WikiText	Revert to
4	2011-05-07 09:49:09	dkf	no	no	4	4
3	2011-05-01 22:58:36	RLE	no	no	3	3
2	2007-02-06 19:54:17	134.243.50.190	no	no	2	2
1	1999-11-26 07:37:55	192.109.213.3	no	no	1	1
0	1999-03-18 21:39:06	194.77.26.150	no	no	0	0