Смотровая яма за 2 дня
Не затратный вариант устройства смотровой ямы.
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![Теория узлов: от шнурков до новых молекул [Veritasium]](https://sun9-14.userapi.com/MA1uplnk7-fw72uTZ10CbbzFfY3l_2-MltTBFQ/dELJIgvm110.jpg)
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