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All answers having "Kindly" as clue:

4 Character Answers:

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NICE



5 Character Answers:

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SWEET

TRYST



6 Character Answers:

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BENIGN

GENIAL

GENTLE

PLEASE



7 Character Answers:

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AFFABLE

CLEMENT



8 Character Answers:

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PATERNAL



9 Character Answers:

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BENIGNANT



11 Character Answers:

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GENTLENIENT

OPENHEARTED

WARMHEARTED



13 Character Answers:

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TENDERHEARTED