учите мат часть, пригодится в дискуссиях на еве https://ru.wikipedia.org/wiki/%D0%A1%D0%BF%D0%B8%D1%81%D0%BE%D0%BA_%D1%81%D1%82%D1%80%D0%B0%D0%BD_%D0%BF%D0%BE_%D0%B4%D0%BE%D0%B1%D1%8B%D1%87%D0%B5_%D0%BF%D1%80%D0%B8%D1%80%D0%BE%D0%B4%D0%BD%D0%BE%D0%B3%D0%BE_%D0%B3%D0%B0%D0%B7%D0%B0