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TOKYO, YOKOHAMA - FEBRUARY 27: Prince William, Duke of Cambridge visits Hodogaya Commonwealth War Graves Cemetery on the second day of his visit to Japan on February 27, 2015 in Yokohama, Japan. The Duke of Cambridge is visiting Japan from February 26th to March 1st 2015. (Photo by James Whatling - Pool/Getty Images)

TOKYO, YOKOHAMA - FEBRUARY 27:  Prince William, Duke of Cambridge visits Hodogaya Commonwealth War Graves Cemetery on the second day of his visit to Japan on February 27, 2015 in Yokohama, Japan. The Duke of Cambridge is visiting Japan from February 26th to March 1st 2015.  (Photo by James Whatling - Pool/Getty Images)