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All answers having "Sufficient" as clue:

3 Character Answers:

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DUE



4 Character Answers:

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ENOW

ENUF

TEEN



5 Character Answers:

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AMPLE

SLOOP



6 Character Answers:

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ENOUGH



7 Character Answers:

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TRACKED

UPTOPAR



8 Character Answers:

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ADEQUATE



10 Character Answers:

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GOODENOUGH

JUSTENOUGH