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©STEPHANIE LECOCQ/EPA/MAXPPP - epa07084988 Dutch King Willem-Alexander (R) and Dutch Queen Maxima (L) arrive at Porta Negra, in Trier, Germany, 11 October 2018. The Dutch royal couple are on a working visit to Rhineland-Palatinate state on 10 and 11 October 2018 at the inivitation of the German state's prime minister Dreyer.