NEW YORK, NY - SEPTEMBER 11: Two firefighters pause and pay their respects at the North pool during a commemoration ceremony for the victims of the September 11 terrorist attacks at the National September 11 Memorial, September 11, 2017 in New York City. In New York City and throughout the United States, the country is marking the 16th anniversary of the September 11 terrorist attacks. (Photo by Drew Angerer/Getty Images)
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