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All answers having "Connection" as clue:

3 Character Answers:

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TIE



4 Character Answers:

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BOND

KNOT

LINK

SEAM

SPAN



5 Character Answers:

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BARGE

NEXUS

TIEIN

TIEUP



6 Character Answers:

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HOOKUP

LINKUP



7 Character Answers:

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CONTACT

KINSHIP

LIAISON

LINKAGE



8 Character Answers:

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RELATION