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/usr/share/bug/man-db/presubj is in man-db 2.7.5-1.

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The actual contents of the file can be viewed below.

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Reporting man-db bugs
---------------------

If you are reporting a bug in the operation of the programs themselves
rather than the packaging, please include the output of the program in
question when run with the --debug flag. For instance, if 'man bash'
fails to display the bash(1) manual page correctly, I will usually want
to see the output of 'man --debug bash'.