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All answers having "Persuasion" as clue:

3 Character Answers:

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ILK



4 Character Answers:

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SECT

TYPE



5 Character Answers:

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TENET



6 Character Answers:

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BELIEF



7 Character Answers:

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OPINION



11 Character Answers:

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ARMTWISTING



15 Character Answers:

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SCHOOLOFTHOUGHT