Кран в бочку
Тоже хотели установить кран в бочку? Тогда это то, что Вам нужно! :-)
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![Уравнение, которое меняет взгляд на мир [Veritasium]](https://sun9-22.userapi.com/RrmOcL3QhaBHy5OqnOnanZsWXkw1uxDQViSSNg/q6kVvqE16Rk.jpg)
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