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All answers having "Infrequent" as clue:

3 Character Answers:

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FEW



4 Character Answers:

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ONCE

RARE



5 Character Answers:

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ACHES



6 Character Answers:

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SCARCE

SPARSE



7 Character Answers:

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UNUSUAL



8 Character Answers:

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SPORADIC

UNCOMMON



10 Character Answers:

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OCCASIONAL