Казань Экзамен ГИБДД
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4 months ago 00:30:08 1
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7 months ago 00:32:22 1
![Почти невозможно: как изобрели синий светодиод [Veritasium]](https://sun9-7.userapi.com/n3xvk14ffW2p-hQt2uEd5yDB81YBtlykFDmP9A/EFtWNxzR5RY.jpg)