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All answers having "Arm bone" as clue:

3 Character Answers:

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RIM



4 Character Answers:

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SPIT

TEAL

ULNA



5 Character Answers:

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DOUBT

LOCUM



6 Character Answers:

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RADIUS



7 Character Answers:

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HUMERUS

MONGREL



12 Character Answers:

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HEARTTOHEART