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King Willem-Alexander and Queen Maxima of the Netherlands chat with Portugal's President Marcelo Rebelo de Sousa (C ) at the Belem Palace in Lisbon, on October 10, 2017, in the first of a 3 days Royals state visit to Portugal. Photo: Pedro Fiuza ( Photo by Pedro Fiúza/NurPhoto via Getty Images)

King Willem-Alexander and Queen Maxima of the Netherlands chat with Portugal's President Marcelo Rebelo de Sousa (C ) at the Belem Palace in Lisbon,  on October 10, 2017, in the first of a 3 days Royals state visit to Portugal. Photo: Pedro Fiuza ( Photo by Pedro Fiúza/NurPhoto via Getty Images)