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@ethereal I think you are mistaken. 6 can be a collective noun but far from necessarily so.

@the moaners
I remember people moaning when Araucaria produced an easy Saturday crossword.

i agree with wordwearys 1st point (plural of the answer with an S is fine - i think repertoires is ok too.
the 2nd point seems irrelevant.
btw. i wasn't one of the "moaners" but it was very easy for a saturday, coupled with a quizword. which i thought was ok.