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All answers having "Petition" as clue:

3 Character Answers:

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ASK

BEG

DUN

SUE



4 Character Answers:

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PLEA

PRAY

SUIT

URGE



5 Character Answers:

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PLEAD



6 Character Answers:

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APPEAL

PRAYER

PRAYTO

SUEFOR



7 Character Answers:

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ENTREAT

REQUEST

SOLICIT



8 Character Answers:

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ENTREATY



10 Character Answers:

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ROUNDROBIN