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All answers having "A-O.K." as clue:

3 Character Answers:

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FAB



4 Character Answers:

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FINE

JAKE



5 Character Answers:

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ROGER



6 Character Answers:

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PEACHY



9 Character Answers:

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HUNKYDORY



10 Character Answers:

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HOTSYTOTSY



12 Character Answers:

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FINEANDDANDY