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All answers having "Say What?" as clue:

3 Character Answers:

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ASK

HUH



4 Character Answers:

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EGAD

HUNH



5 Character Answers:

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AGAIN



8 Character Answers:

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HOWSTHAT



9 Character Answers:

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COMEAGAIN

OVERREACT



13 Character Answers:

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BEGYOURPARDON



15 Character Answers:

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AREYOUKIDDINGME