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All answers having "Slipped." as clue:

4 Character Answers:

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ACOG

DISC

SLID



5 Character Answers:

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ERRED



6 Character Answers:

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GOOFED



7 Character Answers:

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SKIDDED



11 Character Answers:

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MADEABOOBOO



15 Character Answers:

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LOSTONESBALANCE