* x - each year there will be a new release (i.e. 7, 8, 9).
* y - every calendar quarter there will be a new version (i.e. 8.0 8.1, 8.2), starting a at 0 for quarter 1one.
* z - patch and security releases are issued as necessary (i.e. 8.1.1, 8.1.2).
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