Nigerian former Gen. Muhammadu Buhari speaks moments after he was presented with a certificate to show he won the election in Abuja, Nigeria, Wednesday, April 1, 2015. Nigerian President Goodluck Jonathan conceded defeat to Buhari, a 72-year-old former military dictator, who was elected in a historic transfer of power following the nation's most hotly contested election ever. (AP Photo/Sunday Alamba)
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