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All answers having "Unavailable" as clue:

3 Character Answers:

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NFS

OUT

RHO



4 Character Answers:

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BUSY



5 Character Answers:

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INUSE

TAKEN



6 Character Answers:

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BOOKED

FILLED



7 Character Answers:

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ENGAGED

NOTHOME



9 Character Answers:

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SPOKENFOR



10 Character Answers:

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NOTFORSALE