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All answers having "Carry out" as clue:

4 Character Answers:

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OBEY



5 Character Answers:

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ACTON

STAGE



6 Character Answers:

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COMMIT

REMOVE



7 Character Answers:

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ACHIEVE

ENFORCE

EXECUTE

FULFILL

PERFORM

RECYCLE



8 Character Answers:

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TRANSACT



9 Character Answers:

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IMPLEMENT



10 Character Answers:

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PERPETRATE



11 Character Answers:

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BEARWITNESS



12 Character Answers:

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GIVEEFFECTTO