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249 bytes added ,  20:51, 13 September 2013
added note about "invalid multibyte escape" error
If windows complains about ''"Command not found"'', go to the ''Control Panel'' -> ''System'' -> ''Advanced'' -> click on the ''"Environment variables"'' and choose '''path''' in ''"system variables"''. Type in the path (e.g. D\Program Files\Perl\bin\;) where the ruby and perl *.exe files are installed. Generally, the installation is automatic. you may not need the above method.
 
If you get an error similar to ''invalid multibyte escape'' from Ruby, you may need to use a version of Ruby earlier than 1.9. There may be other ways to get around this problem; see e.g. http://gnuu.org/2009/11/02/ruby-1-9-encoding-issues-again/.
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