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All answers having "See 31 Across." as clue:

3 Character Answers:

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ILE

THE

YES



4 Character Answers:

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ALDA

BOSC

EVIL



5 Character Answers:

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CHECK

EVERT

IWONT

TEDDY

THURS



7 Character Answers:

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BURNETT

CASTING

MYSTERY



8 Character Answers:

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EATNOFAT



9 Character Answers:

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EATNOLEAN



12 Character Answers:

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PULLOUTAPLUM



14 Character Answers:

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BREAKONESCROWN

PUTTHEKETTLEON



15 Character Answers:

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CALLFORONESPIPE

GOTOTHECUPBOARD



17 Character Answers:

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FETCHAPAILOFWATER

RUNTHROUGHTHETOWN