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All answers having "Confirmed" as clue:

3 Character Answers:

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BOR

SET



6 Character Answers:

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ARRANT

OKAYED

PROVED

SAIDSO

SEALED



7 Character Answers:

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BOREOUT

CERTAIN

ENSURED



8 Character Answers:

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HARDCORE

RATIFIED

VERIFIED



9 Character Answers:

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CERTIFIED

REENTERED



10 Character Answers:

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ENTRENCHED