Supporters of opposition candidate Muhammadu Buhari, one bound in mock chains, celebrate an anticipated win for their candidate, in Kano, Nigeria Tuesday, March 31, 2015. Nigeria's aviation minister says President Goodluck Jonathan has called challenger Muhammadu Buhari to concede and congratulate him on his electoral victory, paving the way for a peaceful transfer of power in Africa's richest and most populous nation. (Photo by Ben Curtis/AP Photo)
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