rotabor

Imported from a comment discussion on https://ru.stackoverflow.com/questions/1614924/%d0%9d%d1%83%d0%b6%d0%b5%d0%bd-%d0%bc%d0%b0%d1%81%d1%81%d0%b8%d0%b2-%d1%81%d0%bb%d1%83%d1%87%d0%b0%d0%b9%d0%bd%d1%8b%d1%85-%d1%87%d0%b8%d1%81%d0%b5%d0%bb-%d1%81-%d0%bd%d0%b5%d1%80%d0%b0%d0%b2%d0%bd%d0%be%d0%bc%d0%b5%d1%80%d0%bd%d1%8b%d0%bc-%d1%80%d0%b0%d1%81%d0%bf%d1%80%d0%b5%d0%b4%d0%b5%d0%bb%d0%b5%d0%bd%d0%b8%d0%b5%d0%bc