Subj : Re: Unique sets from {1..n} ? To : comp.programming From : TC Date : Tue Jul 12 2005 12:40 am Thnaks for the info, but I have a working algorithm (based on the bit pattern idea) now. The application is something called the "JSM Method" which has been developed by a russian guy & is (I believe) not well known in the west at this time. The method requires the generation of all possible sets of a known fixed number of properties. The set of "no" properties is not of interest to the method & is thus excluded. Cheers, TC .