10 of 24: The Olympic rings are seen atop the iconic Tower Bridge over river Thames in London, coinciding with one month to go until the start of the London 2012 Games, Wednesday, June 27, 2012. The giant rings, which are fully retractable to allow for tall ships to pass through the bridge, will remain in position for the duration of the Games. (AP Photo/Lefteris Pitarakis) (AP Photo/ Lefteris Pitarakis)

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