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All answers having "Vulnerable" as clue:

4 Character Answers:

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OPEN

WEAK



5 Character Answers:

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HUMAN

NASTY



6 Character Answers:

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ATRISK



7 Character Answers:

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EXPOSED



8 Character Answers:

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HELPLESS

WIDEOPEN



9 Character Answers:

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UNGUARDED



10 Character Answers:

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OUTONALIMB