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DAEGU, SOUTH KOREA - SEPTEMBER 04: Caster Semenya of South Africa celebrates her second place in the women's 800 metres final during day nine of 13th IAAF World Athletics Championships at Daegu Stadium on September 4, 2011 in Daegu, South Korea. (Photo by Stu Forster/Getty Images)

DAEGU, SOUTH KOREA - SEPTEMBER 04:  Caster Semenya of South Africa celebrates her second place in the women's 800 metres final during day nine of 13th IAAF World Athletics Championships at Daegu Stadium on September 4, 2011 in Daegu, South Korea.  (Photo by Stu Forster/Getty Images)