NAIROBI, KENYA - OCTOBER 13: Unidentified children walk in mud for to go school on 13 October 2011 in Nairobi, Kenya. Kibera is the largest slum in Nairobi, and the second largest urban slum in Africa
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NAIROBI, KENYA - OCTOBER 13: Unidentified children walk in mud for to go school on 13 October 2011 in Nairobi, Kenya. Kibera is the largest slum in Nairobi, and the second largest urban slum in Africa