И кстати
https://rus.stackexchange.com/questions/46568/%D0%9D%D0%B0-%D0%A3%D0%BA%D1%80%D0%B0%D0%B8%D0%BD%D1%83-%D0%B8%D0%BB%D0%B8-%D0%B2-%D0%A3%D0%BA%D1%80%D0%B0%D0%B8%D0%BD%D1%83