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Britain's Prince William, Duke of Cambridge, right, and Britain's Prince Harry visit the Canadian National Vimy Memorial in Vimy, near Arras, northern France, as part of the commemorations of the 100th anniversary of the Battle of Vimy Ridge, a World War I battle which was a costly victory for Canada but one that helped shape the former British colony's national identity, Sunday, April 9, 2017. (Philippe Huguen/Pool Photo via AP)