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All answers having "Slopes" as clue:

4 Character Answers:

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DIPS



5 Character Answers:

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CANTS

HILLS

LEANS

RAKES

RISES

TILTS



6 Character Answers:

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SLANTS



7 Character Answers:

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ESCARPS



8 Character Answers:

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UPGRADES



9 Character Answers:

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GRADIENTS

HILLSIDES