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FRANKFURT AM MAIN, GERMANY - JUNE 25: (L-R) Hessian Prime Minister Volker Bouffier, Prince Philip, Duke of Edingburgh and Queen Elizabeth II wave to the crowd from the balcony of the city hall 'Roemer' on June 25, 2015 in Frankfurt am Main, Germany. The Queen and Prince Philip are visiting Frankfurt St. Pauls church and the city hall 'Roemer' during their trip, which is their first to Germany since 2004. (Photo by Thomas Lohnes/Getty Images)