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All answers having "Case" as clue:

3 Character Answers:

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BAG

SYN



4 Character Answers:

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ETUI

INNO

TEST



5 Character Answers:

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CRATE

DOZEN

INANY

WORST



6 Character Answers:

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INTHAT

SHEATH



7 Character Answers:

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ARGUMNT

ATTACHE

LAWSUIT

SYNONYM



8 Character Answers:

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INSTANCE

SCOPEOUT



10 Character Answers:

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NOMINATIVE