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WITTENBERG, GERMANY - FEBRUARY 09: King Willem-Alexander and Queen Maxima of the Netherlands sign in the guestbook of the city Wittenberg watched by Reiner Haseloff, governor of Saxony-Anhalt, and his wife Gabriele Haseloff on February 9, 2017 in Wittenberg, Germany. The royal couple are on a working visiting, from February 7-10, 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 Jens Schlueter/Getty Images)

WITTENBERG, GERMANY - FEBRUARY 09: King Willem-Alexander and Queen Maxima of the Netherlands sign in the guestbook of the city Wittenberg watched by Reiner Haseloff, governor of Saxony-Anhalt, and his wife Gabriele Haseloff on February 9, 2017 in Wittenberg, Germany. The royal couple are on a working visiting, from February 7-10, 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 Jens Schlueter/Getty Images)