Савелий, 11 лет, “Лавровская кадриль“ Е.П. Дербенко!
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![[Допсем] Матлогика 4. Исчисление высказываний](https://sun9-23.userapi.com/3c0eyI4BTntOcwj-2vPpzPgtCY8MWlxthouJcQ/ilckPBN00dg.jpg)
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