A sample to work with:

group_1 = A B C
group_2 = 1 2 3 4
group_3 = yellow blue green
group_4 = tiny small medium large gigantic

fixed_size = 2

[download]
Can't you just use standard techniques to pick all combinations of 2 out of a set of 4, picking pairs of groups, then for each pair, calculate the Cartesian product?

In reply to Re: Challenge: Generate fixed size combination across groups without duplicates by JavaFan
in thread Challenge: Generate fixed size combination across groups without duplicates by Limbic~Region

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