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All answers having "Mideast capital" as clue:

4 Character Answers:

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ADEN

DOHA

SANA



5 Character Answers:

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AMMAN

CAIRO

SANAA



6 Character Answers:

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ANKARA

BEIRUT

MUSCAT

RIYADH

TEHRAN



7 Character Answers:

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BAGHDAD

TEHERAN



8 Character Answers:

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ABUDHABI