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All answers having "Mediterranean port" as clue:

4 Character Answers:

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ACRE

GAZA

NICE

ORAN



5 Character Answers:

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GENOA

HAIFA

TUNIS



6 Character Answers:

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BEIRUT



7 Character Answers:

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TELAVIV

TRIPOLI



9 Character Answers:

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BARCELONA



10 Character Answers:

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MARSEILLES