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All answers having "French philosopher" as clue:

4 Character Answers:

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ARON



5 Character Answers:

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COMTE

RENAN

SOREL

TAINE



6 Character Answers:

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PASCAL

SARTRE



7 Character Answers:

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ABELARD

BERGSON

DIDEROT

STSIMON



9 Character Answers:

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DESCARTES



11 Character Answers:

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MONTESQUIEU