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All answers having "Mold" as clue:

3 Character Answers:

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DIE



4 Character Answers:

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CAST

FORM



5 Character Answers:

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FUNGI

SHAPE



6 Character Answers:

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FUNGUS

MATRIX

MILDEW

SCULPT



7 Character Answers:

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RIPENER



10 Character Answers:

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BLACKEARTH



12 Character Answers:

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TRADINGCARDS