Dear forum, Suppose I have a list of n objects and from this I want to get a new list whose elements are the combinations of n objects taken r at a time. How will I be able to use gap for this? Specifically, let S:=[(1,2), (1,3),(2,3)]. If I want to get a list of combinations of these 3 elements taken 2 at a time I must obtain the set T:=[ [(1,2),(1,3)], [(1,3),(2,3)], [(1,2),(2,3)]]. Of course for a larger set it's not easy to do this. Any help? thanks. Levi
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