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All answers having "Ugh!" as clue:

3 Character Answers:

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BAH

FEH

GAH

ICK



4 Character Answers:

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BLEH

ICKY

YECH

YUCK



5 Character Answers:

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BLEAH

GROSS

YECCH



7 Character Answers:

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IHATEIT



8 Character Answers:

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ITSAMESS