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All answers having "Ocean" as clue:

3 Character Answers:

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SEA

TON



4 Character Answers:

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DEEP

MAIN

SCAD

SLEW



5 Character Answers:

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BRINE

BRINY

CANOE

DALAI



6 Character Answers:

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MYRIAD



7 Character Answers:

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OPENSEA

PACIFIC



8 Character Answers:

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ATLANTIC