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All answers having "Make certain" as clue:

3 Character Answers:

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FIB



4 Character Answers:

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SPAM



6 Character Answers:

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AGHAST

ASSURE

CAGILY

EMBODY

ENSURE

GOATEE

INSURE

WEAVER



7 Character Answers:

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SEETOIT



9 Character Answers:

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DETERMINE



13 Character Answers:

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PADDLESTEAMER