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All answers having "Knowledgeable" as clue:

3 Character Answers:

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HEP



4 Character Answers:

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ONTO

WISE



5 Character Answers:

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AWARE

SMART



6 Character Answers:

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TERSER

VERSED



7 Character Answers:

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LEARNED



8 Character Answers:

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EDUCATED

LITERATE

WELLREAD



10 Character Answers:

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WELLVERSED