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BERLIN, GERMANY - JULY 06: King Willem-Alexander and Queen Maxima of the Netherlands arrive at the Konzerthaus am Gendarmenmarkt on July 06, 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 Sean Gallup/Getty Images)

BERLIN, GERMANY - JULY 06:  King Willem-Alexander and Queen Maxima of the Netherlands arrive at the Konzerthaus am Gendarmenmarkt on July 06, 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 Sean Gallup/Getty Images)

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BERLIN, GERMANY - JULY 06: King Willem-Alexander and Queen Maxima of the Netherlands wave as they arrive at the Konzerthaus am Gendarmenmarkt on July 06, 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 Sean Gallup/Getty Images)

BERLIN, GERMANY - JULY 06:  King Willem-Alexander and Queen Maxima of the Netherlands wave as they arrive at the Konzerthaus am Gendarmenmarkt on July 06, 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 Sean Gallup/Getty Images)

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BERLIN, GERMANY - JULY 06: King Willem-Alexander and Queen Maxima of the Netherlands (R) and German President Frank-Walter Steinmeier and First Lady Elke Buedenbender arrive at the Konzerthaus am Gendarmenmarkt on July 06, 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 Sean Gallup/Getty Images)

BERLIN, GERMANY - JULY 06:  King Willem-Alexander and Queen Maxima of the Netherlands (R) and German President Frank-Walter Steinmeier and First Lady Elke Buedenbender arrive at the Konzerthaus am Gendarmenmarkt on July 06, 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 Sean Gallup/Getty Images)

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BERLIN, GERMANY - JULY 06: King Willem-Alexander and Queen Maxima of the Netherlands (R) and German President Frank-Walter Steinmeier wave before entering the Konzerthaus am Gendarmenmarkt on July 06, 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 Sean Gallup/Getty Images)

BERLIN, GERMANY - JULY 06:  King Willem-Alexander and Queen Maxima of the Netherlands (R) and German President Frank-Walter Steinmeier wave before entering the Konzerthaus am Gendarmenmarkt on July 06, 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 Sean Gallup/Getty Images)

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BERLIN, GERMANY - JULY 06: King Willem-Alexander and Queen Maxima of the Netherlands take their seats for a concert at the Konzerthaus at Gendarmenmarkt on July 6, 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 Jens Kalaene - Pool/Getty Images)

BERLIN, GERMANY - JULY 06:  King Willem-Alexander and Queen Maxima of the Netherlands take their seats for a concert at the Konzerthaus at Gendarmenmarkt on July 6, 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 Jens Kalaene - Pool/Getty Images)