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All answers having "Occasionally" as clue:

5 Character Answers:

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SOMEX



7 Character Answers:

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ATTIMES

FORBEAR

TRAINEE



8 Character Answers:

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OFFANDON



9 Character Answers:

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SOMETIMES



10 Character Answers:

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AONCEWHILE

FROMTITOTI

NOWANDTHEN



11 Character Answers:

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EVERANDANON

NOWANDAGAIN



12 Character Answers:

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EVERYSOOFTEN

ONCEINAWHILE



13 Character Answers:

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PARTOFTHETIME



14 Character Answers:

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FROMTIMETOTIME



15 Character Answers:

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EVERYNOWANDTHEN

ONCEINABLUEMOON