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All answers having "___ closed!" as clue:

4 Character Answers:

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CASE

SHUT



5 Character Answers:

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ENDED

SILLY



6 Character Answers:

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SEALED

SINNER

UNOPEN



7 Character Answers:

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NOTOPEN



8 Character Answers:

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UNOPENED



9 Character Answers:

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CONCLUDED



10 Character Answers:

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TERMINATED