Разбор задачи РОИ 2009 D Легкоатлетический манеж МГУ. Часть 1
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![Пожалуй, главное заблуждение об электричестве [Veritasium]](https://sun9-64.userapi.com/xbFbEDnVxU0mUJ9eBoK8MLJJtrn9qvG45P9C4A/zO8TZ2Logfk.jpg)
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