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All answers having "Affirmed" as clue:

5 Character Answers:

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HORSE

SWORE

SWORN



6 Character Answers:

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SAIDSO

YESSED



7 Character Answers:

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AVERRED



8 Character Answers:

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ASSERTED



9 Character Answers:

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RACEHORSE



12 Character Answers:

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CORROBORATED