All k-subsets from an n-set Description

"This recipe yields each subset of size k from a super set of size n."BrothersoftEditor: This recipe yields each subset of size k from a super set of size n. I thought I had seen a recipe that did this before, but when I needed it I couldn't find it. There are two methods. The first operates on sets of integers of the form range(n). The seconds operates on arbitrary sets or lists.