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The legend in the first column:
i = installed
p = installable
deborphan(1) must be installed.
This will, for an application that has already been removed but had its configuration left behind, purge that configuration from the system. To test it out first, you can remove the last -y, and it will show you what it will purge without actually doing it. I mean it never hurts to check first, "just in case." ;)
Purge all configuration files of removed packages