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All answers having "Vital" as clue:

3 Character Answers:

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KEY



4 Character Answers:

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ELAN

LIVE



5 Character Answers:

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ALIVE



6 Character Answers:

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FREEZE

NEEDED

ORGANS



7 Character Answers:

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CRUCIAL

SALIENT



9 Character Answers:

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ESSENTIAL



10 Character Answers:

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IMPERATIVE