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All answers having "Prop." as clue:

3 Character Answers:

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GDS

LEG



4 Character Answers:

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STAY



5 Character Answers:

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BRACE

PLANE

SHORE



7 Character Answers:

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FULCRUM

SHOREUP



8 Character Answers:

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BUTTRESS



16 Character Answers:

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IMPROPERFRACTION