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## Commonalities Among Combinatorial Objects

Permutations and sets of subsets are grouped into a class called SetFuncs. This is useful to help instantiate templates in an orderly manner, though eventually compilers should reach a state where this is no longer a concern. The combinatorial objects described below are represented with Collections, Collectionsof Collections, and operations on these. In this way, all of the commonalities between Collections (copying, comparisons, set primitives, etc.) apply.