Package: packaging-manual Version: 3.0.1.1 Quoting from section 4.2.14:
stable This is the current `released' version of Debian GNU/Linux. A new version is released approximately every 3 months after the development code has been frozen for a month of testing. Once the distribution is stable only major bug fixes are allowed. When changes are made to this distribution, the minor version number is increased (for example: 1.2 becomes 1.2.1 then 1.2.2, etc). But since bo, point releases have been identified like 1.3r2.
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