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Heinähattu, Vilttitossu ja ärhäkkä koululainen
Heinähattu starts school, which little sister Vilttitossu is jealous of. Vilttitossu plans to take his big sister’s place on a class trip where the schoolchildren go on a fishing trip. On the class trip, Vilttitossu causes confusion among the other participants, because he is not used to the school’s rules.