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All answers having "Mitigate" as clue:

4 Character Answers:

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EASE



5 Character Answers:

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ABATE

ALLAY

RELAX



6 Character Answers:

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LESSEN

SOFTEN

SOLACE

TEMPER



7 Character Answers:

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ASSUAGE

LIGHTEN

RELIEVE



8 Character Answers:

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PALLIATE



9 Character Answers:

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ALLEVIATE

EXTENUATE