FILE - This June 27, 2013 file photo shows perimeter box columns from the World Trade Center (WTC) installed in the National Sept. 11 Memorial Museum with a view towards the new 1 World Trade Center, in New York. Recovered from the WTC site after Sept. 11, 2001, this structural steel called “tridents,” rose from the base of the North Tower. The long-awaited museum dedicated to the victims of the Sept. 11 terror attacks will open to the public at the World Trade Center site on May 21, officials announced Monday, March 24, 2014. (AP Photo/Bebeto Matthews, File)
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