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All answers having "50-50 odds" as clue:

4 Character Answers:

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SURE



5 Character Answers:

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EVENS

KARMA

OWNUP



6 Character Answers:

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GREASY

JINXED

PIFFLE

SEESAW

SULTRY



8 Character Answers:

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CAFFEINE



9 Character Answers:

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OUTGOINGS