NSCountedSet+JRCountedSetAdditions.h

@interface NSCountedSet (JRCountedSetAdditions)

- (NSArray *) objectsWithCount:(NSUInteger) count;

@end

NSCountedSet+JRCountedSetAdditions.m

@implementation NSCountedSet (JRCountedSetAdditions) 

- (NSArray *) objectsWithCount:(NSUInteger) count {
   NSMutableArray *array = [NSMutableArray array];
   for(id obj in self) {
      if([self countForObject:obj] == count) {
        [array addObject:obj];
      }  
   }
   return [array copy];
}

@end