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All answers having "Grounds" as clue:

4 Character Answers:

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AREA

LEES

POLO

YARD



5 Character Answers:

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ACRES

BASES

BASIS

CAMPI

CAUSE

DREGS

PROOF



6 Character Answers:

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CAUSES

MOTIVE

REASON



7 Character Answers:

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ACREAGE

REASONS



8 Character Answers:

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TERRAINS



9 Character Answers:

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RATIONALE



10 Character Answers:

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RATIONALES