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All answers having "You don't say!" as clue:

3 Character Answers:

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GEE



4 Character Answers:

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GOSH

MYMY



5 Character Answers:

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OHGEE



6 Character Answers:

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DOTELL

INDEED

INEVER

THATSO



8 Character Answers:

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IDECLARE

ISTHATSO

OHREALLY



9 Character Answers:

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NOKIDDING