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All answers having "SHEep?" as clue:

3 Character Answers:

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EWE

RAM



4 Character Answers:

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EWES

RAMS

TEGS



5 Character Answers:

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ARIES

OVINE



6 Character Answers:

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MERINO

OVINES



7 Character Answers:

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MERINOS



15 Character Answers:

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HAVECLOSESHAVES