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A visitor to the National September 11 Memorial and Museum takes in the sight as he walks past the museum, Friday, Sept. 6, 2013 in New York. Construction is racing ahead inside the museum as the 12th anniversary of the Sept. 11, 2001 attacks draws near. Several more large artifacts have been installed in the cavernous space below the World Trade Center memorial plaza. (AP Photo/Mary Altaffer)

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