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All answers having "Go back over" as clue:

4 Character Answers:

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REDO



5 Character Answers:

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RECAP

TRACE



6 Character Answers:

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REHASH

REREAD



7 Character Answers:

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RECROSS

RETRACE

RETREAD



9 Character Answers:

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REITERATE



12 Character Answers:

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COUNTERPOINT