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BERLIN, GERMANY - JULY 07: King Willem-Alexander and Queen Máxima of the Netherlands pose for a photo at Humboldt Forum on July 07, 2021 in Berlin, Germany. Their Royal Highnesses are paying their first official visit since the global health crisis began over a year ago, with a state visit to Germany from July 5-7. (Photo by Maja Hitij/Getty Images)

BERLIN, GERMANY - JULY 07: King Willem-Alexander and Queen Máxima of the Netherlands pose for a photo at Humboldt Forum on July 07, 2021 in Berlin, Germany. Their Royal Highnesses are paying their first official visit since the global health crisis began over a year ago, with a state visit to Germany from July 5-7. (Photo by Maja Hitij/Getty Images)

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BERLIN, GERMANY - JULY 07: King Willem-Alexander and Queen Máxima of the Netherlands arrive at Humboldt Forum on July 07, 2021 in Berlin, Germany. Their Royal Highnesses are paying their first official visit since the global health crisis began over a year ago, with a state visit to Germany from July 5-7. (Photo by Maja Hitij/Getty Images)

BERLIN, GERMANY - JULY 07: King Willem-Alexander and Queen Máxima of the Netherlands arrive at Humboldt Forum on July 07, 2021 in Berlin, Germany. Their Royal Highnesses are paying their first official visit since the global health crisis began over a year ago, with a state visit to Germany from July 5-7. (Photo by Maja Hitij/Getty Images)

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BERLIN, GERMANY - JULY 07: King Willem-Alexander and Queen Máxima of the Netherlands talk to general manager of Humboldt Forum Helmut Dorgerloh and Berlin Mayor Michael Mueller during their visit in Humboldt Forum on July 07, 2021 in Berlin, Germany. Their Royal Highnesses are paying their first official visit since the global health crisis began over a year ago, with a state visit to Germany from July 5-7. (Photo by Maja Hitij/Getty Images)

BERLIN, GERMANY - JULY 07: King Willem-Alexander and Queen Máxima of the Netherlands talk to general manager of Humboldt Forum Helmut Dorgerloh and Berlin Mayor Michael Mueller during their visit in Humboldt Forum on July 07, 2021 in Berlin, Germany. Their Royal Highnesses are paying their first official visit since the global health crisis began over a year ago, with a state visit to Germany from July 5-7. (Photo by Maja Hitij/Getty Images)

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BERLIN, GERMANY - JULY 07: King Willem-Alexander and Queen Máxima of the Netherlands talk Berlin Mayor Michael Mueller during their visit in Humboldt Forum on July 07, 2021 in Berlin, Germany. Their Royal Highnesses are paying their first official visit since the global health crisis began over a year ago, with a state visit to Germany from July 5-7. (Photo by Maja Hitij/Getty Images)

BERLIN, GERMANY - JULY 07: King Willem-Alexander and Queen Máxima of the Netherlands talk Berlin Mayor Michael Mueller during their visit in Humboldt Forum on July 07, 2021 in Berlin, Germany. Their Royal Highnesses are paying their first official visit since the global health crisis began over a year ago, with a state visit to Germany from July 5-7. (Photo by Maja Hitij/Getty Images)

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BERLIN, GERMANY - JULY 07:Queen Máxima of the Netherlands arrives to Humboldt Forum on July 07, 2021 in Berlin, Germany. Their Royal Highnesses are paying their first official visit since the global health crisis began over a year ago, with a state visit to Germany from July 5-7. (Photo by Maja Hitij/Getty Images)

BERLIN, GERMANY - JULY 07:Queen Máxima of the Netherlands arrives to Humboldt Forum on July 07, 2021 in Berlin, Germany. Their Royal Highnesses are paying their first official visit since the global health crisis began over a year ago, with a state visit to Germany from July 5-7. (Photo by Maja Hitij/Getty Images)