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All answers having "Slope" as clue:

3 Character Answers:

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DIP

RUN



4 Character Answers:

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BANK

BRAE

CANT

DELI

HILL

LEAN

RAKE

RAMP

RISE

SHOW

TILT



5 Character Answers:

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DARTS

GRADE

SLANT

TALUS



6 Character Answers:

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ASCENT

ESCARP

SLEEPY

SPRING



7 Character Answers:

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INCLINE

LACKING

LEONINE

RETREAT

VERSANT



8 Character Answers:

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GRADIENT

HILLSIDE

SANCTITY



9 Character Answers:

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STEEPNESS



10 Character Answers:

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DESPICABLE

ESCARPMENT



13 Character Answers:

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NEFARIOUSNESS