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Nairobi, KENYA: Ugandan President Yoweri Museveni (2nd L), King Mswati of Swaziland (L) and Ethiopian Prime Minister Meles Zenawi (3rd L) listen 22 May 2007 to the opening speech of Kenyan President Mwai Kibaki (R, on screen) at the start of the 12th two-day summit of the Common Market for Eastern and Southern Africa (COMESA) at UN headquarters in Nairobi. The heads of state and government are due to approve important steps toward customs union, set to be launched next year, after their trade ministers last week agreed on a common external tariff deal. AFP PHOTO/SIMON MAINA (Photo credit should read SIMON MAINA/AFP/Getty Images)

Nairobi, KENYA: Ugandan President Yoweri Museveni (2nd L), King Mswati of Swaziland (L) and Ethiopian Prime Minister Meles Zenawi (3rd L) listen 22 May 2007 to the  opening speech of Kenyan President Mwai Kibaki (R, on screen) at the start of the 12th two-day summit of the Common Market for Eastern and Southern Africa (COMESA) at UN headquarters in Nairobi. The heads of state and government are due to approve important steps toward customs union, set to be launched next year, after their trade ministers last week agreed on a common external tariff deal.    AFP PHOTO/SIMON MAINA (Photo credit should read SIMON MAINA/AFP/Getty Images)

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Nairobi, KENYA: From left: Ugandan President Yoweri Museveni, Kenyan President Mwai Kibaki, Djibouti President Ismael Guelleh and Swaziland King Mswati chat 22 May 2007 while on break from the 12th two-day summit of the Common Market for Eastern and Southern Africa (COMESA) at UN headquarters in Nairobi. The heads of state and government are due to approve important steps toward customs union, set to be launched next year, after their trade ministers last week agreed on a common external tariff deal. AFP PHOTO/SIMON MAINA (Photo credit should read SIMON MAINA/AFP/Getty Images)

Nairobi, KENYA: From left: Ugandan President Yoweri Museveni, Kenyan President Mwai Kibaki, Djibouti President Ismael Guelleh and Swaziland King Mswati chat 22 May 2007 while on break from the 12th two-day summit of the Common Market for Eastern and Southern Africa (COMESA) at UN headquarters in Nairobi. The heads of state and government are due to approve important steps toward customs union, set to be launched next year, after their trade ministers last week agreed on a common external tariff deal.    AFP PHOTO/SIMON MAINA (Photo credit should read SIMON MAINA/AFP/Getty Images)

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NAIROBI, KENYA: Ugandan president Yoweri Museveni (L) gives a speech during the opening of the New Partnership for Africa's Development summit (NEPAD) while his counterparts Mwai Kibaki of Kenya (C) and Paul Kagame of Rwanda listen at the Kenyatta International Conference Center in Nairobi, 29 October 2003. AFP PHOTO/SIMON MAINA (Photo credit should read SIMON MAINA/AFP/Getty Images)

NAIROBI, KENYA:  Ugandan president Yoweri Museveni (L) gives a speech during the opening of the New Partnership for Africa's Development summit (NEPAD) while his counterparts Mwai Kibaki of Kenya (C) and Paul Kagame of Rwanda listen at the Kenyatta International Conference Center in Nairobi, 29 October 2003. AFP PHOTO/SIMON MAINA  (Photo credit should read SIMON MAINA/AFP/Getty Images)