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All answers having "Never mind" as clue:

3 Character Answers:

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NAH



4 Character Answers:

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STET



6 Character Answers:

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NONEED

OHDEAR

SKIPIT



7 Character Answers:

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AMNESIA

LETITGO



8 Character Answers:

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FORGETIT

LETALONE

NOMATTER



10 Character Answers:

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OHFORGETIT



11 Character Answers:

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SCRATCHTHAT