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To add further evidence toward your argument, consider also the alternative name, "svn":

http://www.indeed.com/jobtrends?q=cvs%2C+subversion%2C+svn%2...

The popularity would actually be the sum of both.

Not necessarily. Some entries might refer to both but be in the same entry. So the correct way to calculate totals would be `subversion + svn - (subersion and svn)`

The following link should provide the correct unions of job postings:

http://www.indeed.com/jobtrends?q=git%2C+hg+or+mercurial%2C+...

You're right, but in my experience any mention of subversion in a job description tends to only happen once in the document.

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