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All answers having "African capital" as clue:

3 Character Answers:

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RAB



4 Character Answers:

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LOME



5 Character Answers:

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ACCRA

ADDIS

CAIRO

DAKAR

LAGOS

RABAT

TUNIS



6 Character Answers:

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ASMARA

FTLAMY

HARARE



7 Character Answers:

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ALGIERS

NAIROBI

TRIPOLI



8 Character Answers:

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KHARTOUM



10 Character Answers:

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ADDISABABA