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All answers having "Serene" as clue:

3 Character Answers:

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SAY

ZEN



4 Character Answers:

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CALM

EVEN



5 Character Answers:

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QUIET

STILL



6 Character Answers:

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LIMPID

PLACID

SEDATE



7 Character Answers:

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ATPEACE

EARNEST

HALCYON

PACIFIC

RESTFUL

UNFAZED



8 Character Answers:

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BEATIFIC

PEACEFUL

TRANQUIL