In this Wednesday, July 22, 2015, file photo, a man walks away after leaning his bicycle against a mural of President Barack Obama, created by the Kenyan graffiti artist Bankslave, at the GoDown Arts Centre in Nairobi, Kenya, ahead of the visit of Obama. Africa was electrified by the rise of Barack Obama, the first U.S. president of African descent, who took aim at the twin scourges of corruption and dictatorship and sent thousands of troops to fight one of the most terrifying disease outbreaks in decades. (AP Photo/Ben Curtis, File)
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