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All answers having "Briefs" as clue:

4 Character Answers:

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BVDS



5 Character Answers:

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ITEMS



6 Character Answers:

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CUESIN

UNDIES



7 Character Answers:

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DIGESTS



8 Character Answers:

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SYNOPSES



9 Character Answers:

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UNDERWEAR



10 Character Answers:

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UNDERPANTS



11 Character Answers:

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UNDERSHORTS