gyakorlás: https://learningapps.org/watch?v=pfuuz6yk320 https://learningapps.org/2846179 https://learningapps.org/4949886 https://learningapps.org/display?v=p0ubkxmtk18 próbadolgozat: https://app.wizer.me/learn/6DE8A4

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