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LONDON, ENGLAND - DECEMBER 04: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge laugh as a machine sprays snow ahead of their royal highnesses hosting a Christmas party to deliver a message of support to deployed personnel serving in Cyprus and their families over the festive period, at Kensington Palace on December 04, 2018 in London, England. Approximately 7,500 military personnel are currently serving overseas at Christmas. (Photo by Stuart C. Wilson/Getty Images)