We all know what a gear lever is… And also we know about MS DOS, Windows 7, Mac OS X or Linux.
![gear levers gear levers](https://justelite.net/wp-content/uploads/2011/03/gear-lever.jpg)
MS DOS: primary, simple, working good
Windows 7 – complicate, sophisticate, complex
Mac OS X – elegant, easy to operate, simple
Linux – complex, too many options, hard to understand, only for geeks.
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