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Lots of commercial software has version numbers assigned for marketing reasons and largely independent of technical changes.

See Slackware's jump from version 4 to version 7, or more recently, Mozilla's reconfiguration of its versioning system to make the numbers more closely match Chrome and IE version numbers (where v11 and v9 are the current stable releases respectively -- Mozilla is on a measly v4). This doesn't just occur in commercial software.

For example, Windows 7 is internally Windows NT 6.2.

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