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LONDON, ENGLAND - DECEMBER 1: (L-R) Joseph Boakai Vice President of Liberia, Olusegun Obasanjo former president of Nigeria, Peter Mutharika President of Malawi, Prince Andrew, Duke of York, Hage Geingob President of Namibia, Akinwunmi Ambode Governor of Lagos State, Aliko Dangote and Mr Abdisalam Omer Somalia Foreign Affairs Minister during the London Global African Investment Summit at St James' Palace on December 1, 2015 in London, England. (Photo by Anthony Devlin-WPA Pool/Getty Images)

LONDON, ENGLAND - DECEMBER 1: (L-R) Joseph Boakai Vice President of Liberia, Olusegun Obasanjo former president of Nigeria, Peter Mutharika President of Malawi, Prince Andrew, Duke of York, Hage Geingob President of Namibia, Akinwunmi Ambode Governor of Lagos State, Aliko Dangote and Mr Abdisalam Omer Somalia Foreign Affairs Minister during the London Global African Investment Summit at St James' Palace on December 1, 2015 in London, England. (Photo by Anthony Devlin-WPA Pool/Getty Images)