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FRANKFURT AM MAIN, GERMANY - JUNE 25: People gather at the Roemer, the townhall of Frankfurt, during the state visit of Queen Elizabeth II and her husband Prince Philip to Germany on June 25, 2015 in Frankfurt am Main, Germany. (Photo by Hannelore Foerster/Getty Images)

FRANKFURT AM MAIN, GERMANY - JUNE 25: People gather at the Roemer, the townhall of Frankfurt, during the state visit of Queen Elizabeth II and her husband Prince Philip to Germany on June 25, 2015 in Frankfurt am Main, Germany.  (Photo by Hannelore Foerster/Getty Images)