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Nigeria is Africa's biggest economy and the continent's most populous state, but a recent spate of violence raises questions about the government's ability to provide security. The FT's Vanessa Kortekaas reports on the battle for power in the country.
► FT World News: http://bit.ly/1Exp0iJ
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► What Buhari Win Means For Nigeria: http://bit.ly/1Cfm4HR
