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All answers having "Double-check" as clue:

3 Character Answers:

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RHO



5 Character Answers:

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READD



6 Character Answers:

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ENSURE

REREAD

RETEST



7 Character Answers:

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RETOTAL



8 Character Answers:

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MAKESURE

REINSERT



11 Character Answers:

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MAKECERTAIN