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A British flag floats in front of the 'Big Ben' clock Tower on July 23, 2012 in London, four days before the start of the London 2012 Olympic Games. Seven years in the making, costing £9.3 billion ($14.5 billion) and featuring 10,490 athletes, the London Olympics opens on July 27 with 302 gold medals to be won and hard-fought reputations at stake. AFP PHOTO / FABRICE COFFRINI (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)

A British flag floats in front of the 'Big Ben' clock Tower on July 23, 2012 in London, four days before the start of the London 2012 Olympic Games. Seven years in the making, costing £9.3 billion ($14.5 billion) and featuring 10,490 athletes, the London Olympics opens on July 27 with 302 gold medals to be won and hard-fought reputations at stake.    AFP PHOTO / FABRICE COFFRINI        (Photo credit should read FABRICE COFFRINI/AFP/Getty Images)