обычно. Гугль всё знает: https://www.google.com.ua/search?q=%D0%B3%D1%80%D0%B0%D0%B4%D1%83%D1%81%D1%8B+%D0%B7%D0%BD%D0%B0%D0%BA%D0%B0+%D0%B7%D0%BE%D0%B4%D0%B8%D0%B0%D0%BA%D0%B0&hl=ru-UA&biw=&bih=&gbv=2&oq=%D0%B3%D1%80%D0%B0%D0%B4%D1%83%D1%81%D1%8B+%D0%B7%D0%BD%D0%B0%D0%BA%D0%B0+%D0%B7%D0%BE%D0%B4%D0%B8%D0%B0%D0%BA%D0%B0&gs_l=heirloom-serp.12..0i22i30l3.598569.603146.0.606651.21.17.0.0.0.0.554.2347.2-2j1j2j1.6.0....0...1ac.1.34.heirloom-serp..15.6.2347.HIxWHjBEJ7w