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All answers having "Previous" as clue:

3 Character Answers:

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OLD



4 Character Answers:

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FORE

LATE

PAST



5 Character Answers:

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PRIOR



6 Character Answers:

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FORMER

SLEEPY

YESTER



7 Character Answers:

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EARLIER

EARMARK

OBELISK

ONETIME



8 Character Answers:

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ANTERIOR

FOREGONE

TERRAPIN



10 Character Answers:

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ANTECEDENT



11 Character Answers:

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RESPIRATION