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HANOI, HANOI - NOVEMBER 16: Prince William, Duke of Cambridge talks with Vietnamese Prime Minister Nguyen Xuan Phuc at the Prime Minister's Residence during a two day visit to Vietnam on November 16, 2016 in Hanoi, Vietnam. The Duke is in Vietnam primarily to attend the third International Conference on the Illegal Wildlife Trade. (Photo by Chris Jackson/Getty Images)

HANOI, HANOI - NOVEMBER 16:  Prince William, Duke of Cambridge talks with Vietnamese Prime Minister Nguyen Xuan Phuc at the Prime Minister's Residence during a two day visit to Vietnam on November 16, 2016 in Hanoi, Vietnam. The Duke is in Vietnam primarily to attend the third International Conference on the Illegal Wildlife Trade.  (Photo by Chris Jackson/Getty Images)