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All answers having "Pair" as clue:

3 Character Answers:

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DUO

RHO

SET

TWA

TWO



4 Character Answers:

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DEUX

DUAD

DUET

DYAD

HAND

ITEM

SPAN

YOKE



5 Character Answers:

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BRACE

TWAIN



6 Character Answers:

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CATTLE

COUPLE

GEMINI

RUEFUL

SCRAWL



7 Character Answers:

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DOUBLET

TWOSOME



8 Character Answers:

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SETOFTWO



9 Character Answers:

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LIVESTOCK



10 Character Answers:

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MANANDWIFE



13 Character Answers:

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SHOESPURCHASE