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All answers having "Sofa" as clue:

3 Character Answers:

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BED



4 Character Answers:

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ODDS

SEAT



5 Character Answers:

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COUCH

DIVAN

INANE

LIVID

REINA



6 Character Answers:

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DRYRUN

LOUNGE

SENIOR

SETTEE



7 Character Answers:

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LIGHTER

RULEOUT

SHACKUP

TRIUMPH

UNEARTH



9 Character Answers:

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DAVENPORT

TRUSTFUND



12 Character Answers:

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CHESTERFIELD

SUBTERRANEAN