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All answers having "It's true" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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FACT



5 Character Answers:

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AFACT

DATUM

EVERO

NOLIE



6 Character Answers:

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ISWEAR

VERITY



8 Character Answers:

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STINGRAY



9 Character Answers:

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NOFOOLING