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All answers having "Cardinal" as clue:

3 Character Answers:

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RED

SIN



4 Character Answers:

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BIRD

MAIN

NLER

REDS

RULE



5 Character Answers:

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CHIEF

COLOR



6 Character Answers:

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REDHAT



7 Character Answers:

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DEEPRED

PRELATE

REDBIRD



10 Character Answers:

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HOLYPERSON

TYPEOFBIRD



11 Character Answers:

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FUNDAMENTAL



13 Character Answers:

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MOSTIMPORTANT