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All answers having "Huzzah!" as clue:

3 Character Answers:

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OLE

RAH

YAY



4 Character Answers:

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HAIL



5 Character Answers:

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BRAVO

CHEER

YAHOO



6 Character Answers:

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YIPPEE



8 Character Answers:

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WELLDONE



10 Character Answers:

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OHHAPPYDAY