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All answers having "Classified ___" as clue:

3 Character Answers:

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ADS



5 Character Answers:

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CODED

RATED

SRTED

TYPED



6 Character Answers:

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PEGGED

SECRET

SORTED

WANTAD



7 Character Answers:

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SMALLAD



8 Character Answers:

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ARRANGED

HUSHHUSH

PERSONAL



9 Character Answers:

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TOPSECRET



12 Character Answers:

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CONFIDENTIAL