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All answers having "Step on it" as clue:

3 Character Answers:

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GAS

HIE

RIP



4 Character Answers:

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PATH

RUSH

SOLE



5 Character Answers:

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FLOOR

HURRY

PEDAL

SCALE

STAIR



6 Character Answers:

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FASTER

HASTEN

INSOLE

SCURRY



7 Character Answers:

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FOOTPAD



8 Character Answers:

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GASPEDAL

LINOLEUM



9 Character Answers:

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FLOORTILE

SHAKEALEG



10 Character Answers:

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LADDERRUNG

WELCOMEMAT



12 Character Answers:

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BOARDINGRAMP

DOCTORSSCALE



13 Character Answers:

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GETTHELEADOUT

PEDESTRIANWAY