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All answers having "Be careful!" as clue:

4 Character Answers:

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EASY



5 Character Answers:

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TERSE



6 Character Answers:

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BEWARE

STEADY



7 Character Answers:

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LOOKOUT

WATCHIT



8 Character Answers:

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PLAYSAFE

STAYSAFE

STAYSAFE

WATCHOUT



13 Character Answers:

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EASYDOESITNOW

WATCHONESSTEP