Недетский тур. Фестиваль исполнителей авторской песни “Эхо - 2021“
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![Задача №255 [НЕДЕТСКАЯ ГЕОМЕТРИЯ #1]](https://sun9-46.userapi.com/8WTq2KULMYPlTjaxwhNXJDIRbPavycwrseWNFg/EBBJ3D6e_HE.jpg)
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