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All answers having "Petitions" as clue:

4 Character Answers:

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ASKS

BEGS

PEAS

SUES

WOOS



5 Character Answers:

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PLEAS

PRAYS



6 Character Answers:

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PLEADS



7 Character Answers:

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ASKSFOR

PRAYSTO



8 Character Answers:

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ENTREATS

SOLICITS



9 Character Answers:

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BESEECHES