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Photo by: Charles Dharapak

Verne Harris (second from left) shows artifacts from former South African President Nelson Mandela's imprisonment to (from third from left) U.S. first lady Michelle Obama; her mother, Marian Robinson; her daughter Sasha; and Graca Machel, Mr. Mandela's wife, during a visit to the Nelson Mandela Foundation in Johannesburg on Tuesday, June 21, 2011. (AP Photo/Charles Dharapak, Pool)

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