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All answers having "Pondered" as clue:

5 Character Answers:

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DWELT

MUSED

PORED



6 Character Answers:

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MULLED



7 Character Answers:

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BROODED

SLEPTON



8 Character Answers:

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WONDERED



9 Character Answers:

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MEDITATED

MUSEDOVER



10 Character Answers:

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CONSIDERED