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U.S. national flags are seen at half-staff at the Washington Monument in tribute to former U.S. President George H. W. Bush in Washington D.C. Dec. 1, 2018. (Xinhua/Ting Shen)

U.S. national flags are seen at half-staff at the Washington Monument in tribute to former U.S. President George H. W. Bush in Washington D.C. Dec. 1, 2018. (Xinhua/Ting Shen)