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FILE - In this Sunday, June 23, 2013 file photo, daredevil Nik Wallenda speaks during a news conference after crossing a tightrope 1,500 feet above the Little Colorado River Gorge, on the Navajo reservation outside the boundaries of Grand Canyon National Park. Wallenda is in Chicago scouting possible locations for a tightrope walk between two Windy City skyscrapers in the fall. The high-wire walker told the Chicago Sun-Times on Thursday, April 17, 2014, that the first place he would check out is Willis Tower, which was formerly known as the Sears Tower and was the tallest building in the U.S. until recently. (AP Photo/Rick Bowmer, file)

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