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All answers having "Acknowledged" as clue:

4 Character Answers:

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EADS

SEEN



5 Character Answers:

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CITED

GIVEN

OWNED



6 Character Answers:

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AVOWED

SAIDHI



7 Character Answers:

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GRUNTED

THANKED



8 Character Answers:

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ADMITTED

CONCEDED



9 Character Answers:

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CONFESSED