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A pupil takes a Corona antigen rapid test before the start of lessons at the Katharina Henoth Comprehensive School in Cologne, Germany, Monday, April 19, 2021. After a week of lessons at home, many children and adolescents in North Rhine-Westphalia have been able to return to their schools for face-to-face lessons since Monday. (Marius Becker/dpa via AP)

A pupil takes a Corona antigen rapid test before the start of lessons at the Katharina Henoth Comprehensive School in Cologne, Germany, Monday, April 19, 2021. After a week of lessons at home, many children and adolescents in North Rhine-Westphalia have been able to return to their schools for face-to-face lessons since Monday. (Marius Becker/dpa via AP)

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