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All answers having "Repeatedly" as clue:

3 Character Answers:

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OFT

YES



4 Character Answers:

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ALOT

EVER



5 Character Answers:

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AGAIN

OFTEN



6 Character Answers:

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THRICE



7 Character Answers:

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OTALGIA



8 Character Answers:

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OFTTIMES



10 Character Answers:

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YINANDYOUT



11 Character Answers:

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OVERANDOVER



12 Character Answers:

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TIMEANDAGAIN



13 Character Answers:

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AGAINANDAGAIN

TIMEAFTERTIME