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Pupils hide under a ping-pong table during the afternoon break at the day school Bungertwies in Zurich, Switzerland, on March 2, 2015. The school has two kindergartens (1st and 2nd kindergarten year) and six classes of mixed ages (1st to 3rd grade and 4th to 6th grade). The mixed age group system means that the children can study together and learn from each other. (KEYSTONE/Gaetan Bally)