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All answers having "c." as clue:

3 Character Answers:

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CEN

ETC

IOO



4 Character Answers:

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CLEF

CTRL

FAIR

SPAN



5 Character Answers:

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CLAMP



6 Character Answers:

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CARBON



7 Character Answers:

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AVERAGE



9 Character Answers:

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CANOPENER



10 Character Answers:

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CARSTARTER

CLAMPSHAPE

ONEHUNDRED



11 Character Answers:

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AVERAGEMARK

DOUBLECROSS

EPCOTCENTER

GEORGESCOTT



13 Character Answers:

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SOUNDOFATOAST



15 Character Answers:

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COMMUNITYLEADER

KEYWITHNOSHARPS

ROMANONEHUNDRED

SYMBOLFORCARBON

VITAMININLEMONS



17 Character Answers:

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CIVILRIGHTSLEADER