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Britain's Prince Charles, Prince of Wales (L) greets Chinese President Xi Jinping (2R) and his wife Peng Liyuan (R) at a hotel in central London on October 20, 2015 on the first official day of a state visit. Chinese President Xi Jinping arrived for a four-day state visit as the government of Prime Minister David Cameron seeks stronger trade ties with the world's second-largest economy. AFP PHOTO / POOL / JUSTIN TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

Britain's Prince Charles, Prince of Wales (L) greets Chinese President Xi Jinping (2R) and his wife Peng Liyuan (R) at a hotel in central London on October 20, 2015 on the first official day of a state visit. Chinese President Xi Jinping arrived for a four-day state visit as the government of Prime Minister David Cameron seeks stronger trade ties with the world's second-largest economy. AFP PHOTO / POOL / JUSTIN TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)