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NthKSubset and RankKSubset. Where ???


Hello

I'm working on a combinatorical problem and I would need two functions which are
not available in Mma or the Combinatorica package. The first would probably be
called NthKSubset and should give me the Nth KSubset of a list (who would have
guessed that). The other one which I need is a routine which does the opposite.
Given a KSubset it should give me the rank of that KSubset.

Has anyone written such functions or know from where to get them ?
A description of an algorithm for programming them would also be okay.


Many thanks in advance

		Axel Kowald



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