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This June 27, 2014 file photo, shows the Olympic Arena, top, and the Maria Lenk Aquatics Center under construction in Rio de Janeiro, Brazil. Two winners will get to stay overnight next week, in April 2016, in a converted VIP box set up in the Olympic Arena, which is holding a test event in gymnastics. The room is the prize in a publicity contest put on by Airbnb, a sponsor of the Rio de Janeiro Olympics. (KEYSTONE/AP Photo/Leo Correa)