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All answers having "Credo" as clue:

3 Character Answers:

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ISM



5 Character Answers:

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DOGMA

ETHIC

TENET



6 Character Answers:

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BELIEF



7 Character Answers:

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BELIEFS

PRECEPT



10 Character Answers:

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EQUIVOCATE



11 Character Answers:

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PONTIFICATE

PREVARICATE