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All answers having "Learn" as clue:

3 Character Answers:

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CON

GET

RHO



4 Character Answers:

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HEAR



5 Character Answers:

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GLEAN

RENAL



6 Character Answers:

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ABSORB

HEAROF

MASTER

PROFIT

TAKEUP



7 Character Answers:

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ENLARGE

GENERAL

REALINE



8 Character Answers:

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MEMORIZE