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TRESCO, ISLES OF SCILLY - SEPTEMBER 02: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the Tresco Abbey Garden on September 2, 2016 in Tresco, England. (Photo by Peter Nicholls - WPA Pool /Getty Images)

TRESCO, ISLES OF SCILLY - SEPTEMBER 02:  Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the Tresco Abbey Garden on September 2, 2016 in Tresco, England.  (Photo by Peter Nicholls - WPA Pool /Getty Images)