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All answers having "Holy smokes!" as clue:

3 Character Answers:

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GEE

MAN

OMG

WOW

YOW



4 Character Answers:

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EGAD

GOSH



5 Character Answers:

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EGADS

GOLLY

YIPES

ZOWIE



6 Character Answers:

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CRIKEY

OHBABY

ZOUNDS



8 Character Answers:

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MANALIVE

MANOHMAN