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All answers having "Outer edge" as clue:

3 Character Answers:

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LIP

RHO

RIM



4 Character Answers:

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IDLE

MUSH

RHYL

STEM



5 Character Answers:

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LIMIT

SKIRT



6 Character Answers:

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FRINGE



8 Character Answers:

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FLAMINGO



9 Character Answers:

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PERIMETER