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All answers having "Emphatic denial" as clue:

4 Character Answers:

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LIAR

LIES

NONO

OHNO



5 Character Answers:

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IAMSO

NEVER

NOSIR

NOWAY



6 Character Answers:

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GOSHNO

HELLNO

IAMNOT

IDONOT

NONONO



7 Character Answers:

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IDIDNOT

ISAIDNO

ITSALIE

NONEVER

NOSIREE

YOULIAR



9 Character Answers:

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INDEEDNOT

THATSALIE



11 Character Answers:

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OFCOURSENOT