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WEIMAR, GERMANY - FEBRUARY 08: King Willem-Alexander and Queen Maxima of the Netherlands visit the Buchenwald concentration camp on February 8, 2017 in Weimar, Germany. The royal couple will pay a working visiting from February 7 to 10 to the German Bundeslaender Thuringia, Saxony and Saxony-Anhalt in order to deepen trade and investment relations and promote cooperation in high-tech systems, chemicals and flood protection sectors. (Photo by Franziska Krug/Getty Images)

WEIMAR, GERMANY - FEBRUARY 08: King Willem-Alexander and Queen Maxima of the Netherlands visit the Buchenwald concentration camp on February 8, 2017 in Weimar, Germany. The royal couple will pay a working visiting from February 7 to 10 to the German Bundeslaender Thuringia, Saxony and Saxony-Anhalt in order to deepen trade and investment relations and promote cooperation in high-tech systems, chemicals and flood protection sectors. (Photo by Franziska Krug/Getty Images)