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All answers having "Hasten" as clue:

3 Character Answers:

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HIE

RUN



4 Character Answers:

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DASH

RUSH



5 Character Answers:

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HURRY

SPEED



6 Character Answers:

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ATHENS

HUSTLE

LISBON

SCURRY



7 Character Answers:

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CAMPERS

SPEEDUP



8 Character Answers:

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EXPEDITE

MAKETIME



10 Character Answers:

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ACCELERATE