https://rtfm.wiki/notes/poetry/%D0%B3%D1%80%D1%83%D0%B1%D1%8B%D0%BC_%D0%B4%D0%B0%D0%B5%D1%82%D1%81%D1%8F_%D1%80%D0%B0%D0%B4%D0%BE%D1%81%D1%82%D1%8C