diff -r 64823cdde6a5 -r 2d492d8c2053 CollectionUtils.h
--- a/CollectionUtils.h	Mon Apr 14 13:58:48 2008 -0700
+++ b/CollectionUtils.h	Fri Apr 18 09:25:10 2008 -0700
@@ -45,6 +45,12 @@
 @end
 
 
+@interface NSSet (MYUtils)
++ (NSSet*) my_unionOfSet: (NSSet*)set1 andSet: (NSSet*)set2;
++ (NSSet*) my_differenceOfSet: (NSSet*)set1 andSet: (NSSet*)set2;
+@end
+
+
 #pragma mark -
 #pragma mark FOREACH: