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HAMBURG, GERMANY - JULY 21: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George of Cambridge and Princess Charlotte of Cambridge view helicopter models H145 and H135 before departing from Hamburg airport on the last day of their official visit to Poland and Germany on July 21, 2017 in Hamburg, Germany. (Photo by Samir Hussein/WireImage)

HAMBURG, GERMANY - JULY 21:  Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George of Cambridge and Princess Charlotte of Cambridge view helicopter models H145 and H135 before departing from Hamburg airport on the last day of their official visit to Poland and Germany on July 21, 2017 in Hamburg, Germany.  (Photo by Samir Hussein/WireImage)