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All answers having "Squares" as clue:

4 Character Answers:

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DICE



5 Character Answers:

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EVENS

MEALS

NERDS

QUADS



6 Character Answers:

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AGORAE

FOGEYS

RHOMBI

SUBSET



7 Character Answers:

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EVENSUP

PIAZZAS

SETTLES



9 Character Answers:

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QUADRATES