Просвещайтесь https://ru.m.wikipedia.org/wiki/%D0%A8%D0%BC%D1%8B%D0%BA%D0%BE%D0%B2%D0%B0,_%D0%92%D0%B0%D1%80%D0%B2%D0%B0%D1%80%D0%B0_%D0%A0%D0%BE%D0%BC%D0%B0%D0%BD%D0%BE%D0%B2%D0%BD%D0%B0