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SOUTH AFRICA - JUNE 02: A group of American and South African students, aged from 11 to 19, met with Nelson Mandela at the Nelson Mandela Foundation in Johannesburg, on 2 June 2009. This is part of a series of activities ahead of Mandela Day on 18 July. (Photo by Media24/Gallo Images/Getty Images)

SOUTH AFRICA - JUNE 02:  A group of American and South African students, aged from 11 to 19, met with Nelson Mandela at the Nelson Mandela Foundation in Johannesburg, on 2 June 2009. This is part of a series of activities ahead of Mandela Day on 18 July.  (Photo by Media24/Gallo Images/Getty Images)