Statistics for World capitals - only one vowel - but repeated

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Vowel	Capital	% Correct
O	OSLO, Norway	82%
O	LONDON, United Kingdom	69%
A	ANKARA, Turkey	68%
O	MOSCOW, Russia	62%
A	ACCRA, Ghana	60%
I	DILI, East Timor	60%
A	ASTANA, Kazakhstan	57%
O	TOKYO, Japan	57%
A	HAVANA, Cuba	54%
A	JAKARTA, Indonesia	54%
A	AMMAN, Jordan	51%
A	CARACAS, Venezuela	51%
A	RABAT, Morocco	51%
A	ASMARA, Eritrea	49%
A	BAGHDAD, Iraq	49%
A	MANAMA, Bahrain	46%
A	SANA'A, Yemen	46%
A	ASHGABAT, Turkmenistan	45%
A	KAMPALA, Uganda	45%
A	DAKAR, Senegal	43%
A	LA PAZ, Bolivia (administrative capital)	43%
O	STOCKHOLM, Sweden	43%
A	DHAKA, Bangladesh	40%
I	TBILISI, Georgia	40%
A	WARSAW, Poland	38%
A	TARAWA, Kiribati	28%
O	PORTO-NOVO, Benin	26%