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All answers having "Verify" as clue:

3 Character Answers:

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VET



4 Character Answers:

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AVER



5 Character Answers:

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AUDIT

BERYL

CHECK

PROVE

VOUCH



6 Character Answers:

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AFFIRM

ATTEST



7 Character Answers:

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ADMIRAL

CONFIRM

REENTER



8 Character Answers:

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ATTESTTO

REAFFIRM