Stock Photo - ILLUSTRATION - 06 January 2022, North Rhine-Westphalia, Bielefeld: FFP and surgical masks lie in a classroom from Max Planck High School. School operations face major challenges during the Corona crisis. Behavioral measures, hygiene and protective measures, ventilation, wearing of mouth-nose protection and repeated quarantine cases have to be managed. Photo: Friso Gentsch/dpa. - Bielefeld/North Rhine-Westphalia/Germany

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