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All answers having "Cry of exasperation" as clue:

3 Character Answers:

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GAH

GOD

RHO



4 Character Answers:

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OHNO

RATS



5 Character Answers:

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AARGH

IQUIT



6 Character Answers:

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HOOBOY

OHLORD

OMIGOD

SHEESH



8 Character Answers:

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HONESTLY

IVEHADIT