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WARSAW, POLAND - JULY 17: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge at the Wall of Remembrance as they visit the Warsaw Rising Museum which is dedicated to the uprising of 1944 which saw the Polish resistance Home Army attempt to liberate Warsaw from German occupation on day 1 of their offical visit to Poland on July 17, 2017 in Warsaw, Poland. (Photo by Jane Barlow - Pool/Getty Images)

WARSAW, POLAND - JULY 17:  Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge at the Wall of Remembrance as they visit the Warsaw Rising Museum which is dedicated to the uprising of 1944 which saw the Polish resistance Home Army attempt to liberate Warsaw from German occupation on day 1 of their offical visit to Poland on July 17, 2017 in Warsaw, Poland.  (Photo by Jane Barlow -  Pool/Getty Images)