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All answers having "Allowed" as clue:

3 Character Answers:

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LET

OKD

RHO



4 Character Answers:

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OKED



5 Character Answers:

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LEGAL

LEGIT

LICIT



6 Character Answers:

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KOSHER

LAWFUL

OKAYED

TYRANT



7 Character Answers:

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ENABLED

GRANTED



8 Character Answers:

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CONDONED



9 Character Answers:

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PERMITTED