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All answers having "Minuscule" as clue:

3 Character Answers:

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SMA

WEE



4 Character Answers:

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EENY

ITSY

ITTY

TINY



5 Character Answers:

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EENSY

TEENY



6 Character Answers:

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ATOMIC

PALTRY

TEENIE

TEENSY



7 Character Answers:

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TRIVIAL



9 Character Answers:

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ITTYBITTY



10 Character Answers:

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TEENYWEENY



13 Character Answers:

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INFINITESIMAL