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in reply to Re^4: Efficient Unique Nested Combinations
in thread Efficient Unique Nested Combinations

No I meant to just iterate nested next-combinations but it comes to my attention that actually both loops were degenerate (nCn and nC1) so that M::C would be doing nothing more than returning next elements in arrays, which might as well be handrolled anyway. To assure unique selections from inner arrays, the OPs hash idea seems now as good as any.