U.S. Secretary of State John Kerry, left, talks with newly inaugurated Nigerian President Muhammadu Buhari, before the start of a formal meeting in Abuja, Nigeria, Friday, May 29, 2015. Nigerians celebrated their newly reinforced democracy Friday, dancing and singing at the inauguration of President Muhammadu Buhari, the first candidate to beat a sitting president at the polls. (AP Photo/Susan Walsh, Pool)
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