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All answers having "Yippee!" as clue:

3 Character Answers:

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OLE

RAH

YAY



4 Character Answers:

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WHEE

WOOT



5 Character Answers:

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OHBOY

WAHOO

WHOOP

YAHOO

ZOWIE



6 Character Answers:

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HOORAH

HOORAY

HOTDOG

HURRAH

HURRAY

IDIDIT

WOOHOO



10 Character Answers:

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HOTDIGGETY