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UNITED STATES - Oct 22: The flag flies at half-staff at the Cannon House Office Building in Washington, D.C. to pay tribute to the victims of the Nevada school shooting's Tuesday October 22, 2013. (Photo By Douglas Graham/CQ Roll Call)

UNITED STATES - Oct 22: The flag flies at half-staff at the Cannon House Office Building in Washington, D.C. to pay tribute to the victims of the Nevada school shooting's Tuesday October 22, 2013. (Photo By Douglas Graham/CQ Roll Call)

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