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All answers having "Twins" as clue:

3 Character Answers:

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DUO

OVA



4 Character Answers:

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PAIR

SIBS



6 Character Answers:

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CLONES

GEMINI

LAPFUL



10 Character Answers:

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TWOOFAKIND



13 Character Answers:

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MINNESOTATEAM



15 Character Answers:

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DANNYDEVITOFILM

SIGNOFTHEZODIAC