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All answers having "Careful!" as clue:

3 Character Answers:

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HUP



4 Character Answers:

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DOBE

WARY



5 Character Answers:

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ALERT

CANNY

CHARY



6 Character Answers:

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BEWARE



7 Character Answers:

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HEADSUP



8 Character Answers:

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CAUTIOUS

WATCHOUT



10 Character Answers:

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EASYDOESIT