Bulgaria's Vania Stambolova (R) crashes into a hurdle as Lithuania's Egle Staisiunaite (L) and T'Erea Brown of the U.S. run in the women's 400m hurdles round 1 heat during the London 2012 Olympic Games at the Olympic Stadium August 5, 2012. REUTERS/David Gray (BRITAIN - Tags: OLYMPICS SPORT ATHLETICS TPX IMAGES OF THE DAY)
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