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All answers having "Very cold" as clue:

3 Character Answers:

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ICY

RHO



4 Character Answers:

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ICED



5 Character Answers:

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GELID

STREW



6 Character Answers:

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ARCTIC

FRIGID

RESIGN



7 Character Answers:

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EDWARDI

LIKEICE

PRAIRIE



8 Character Answers:

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FREEZING



9 Character Answers:

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BELOWZERO

HEARTLESS