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  • Lüften durch offene Fenster in Schule oder Universität

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  • Open windows when ventilating the classroom due to Covid-19

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  • Plexiglas Trennwände in Klassenraum einer Schule

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  • Abstand im Klassenzimmer vor Abitur Prüfung in Schule

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  • School blackboard on wall in empty classroom of a school

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