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[P4N5] Rephrased.

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lib/presentations/qp/perl-for-newbies/5/src/version-control/index.html.wml

 <a href="http://better-scm.shlomifish.org/">Version control systems</a>
 are also known as “revision control systems”, and “source control systems”.
 Version control is considered part of “software configuration management” (SCM)
-and there are also more comprehensive SCM systems.
-These are programs that allow one to maintain various historical versions of
+and there are also some more comprehensive SCM systems.
+Version control programs allow one to maintain various historical versions of
 one's data, retrieve earlier versions, and do other operations like
 branching or tagging.
 </p>
 
 <p>
 This section will give the motivation for why you should start using
-version control for your software development and will give a short
+version control for your software development, and will give a short
 demonstration using the Mercurial version control system. Feel free to skip
 this section if you're already drinking the version control kool-aid.
 </p>