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All answers having "Pine-___" as clue:

3 Character Answers:

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FIR

RHO

SOL

TAR

YEN



4 Character Answers:

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ACHE

CONE

LONG

MOPE

TREE

WOOD



5 Character Answers:

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LARCH

SCREW

YEARN



6 Character Answers:

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KNOTTY

NEEDLE



15 Character Answers:

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EATONESHEARTOUT