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All answers having "Flawed" as clue:

3 Character Answers:

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BAD

IRR

RHO



5 Character Answers:

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AMISS

IRREG

RUNON



6 Character Answers:

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FAULTY



7 Character Answers:

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DAMAGED



9 Character Answers:

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IMPERFECT



12 Character Answers:

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NOTFOOLPROOF