This file is indexed.

/usr/share/bug/preview-latex-style/presubj is in preview-latex-style 11.87-1ubuntu2.

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The actual contents of the file can be viewed below.

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Remember to cover the basics, that is, what you expected to happen and
what in fact did happen.

If the bug (or problem) is triggered by a particular file, you should
try to produce a minimal (the shortest the better) sample file which
triggers the problem and include it in your report.

Your bug report will NOT be automatically sent to the preview-latex
upstream developers.  It will be sent to the Debian Bug Tracking System
<URL:http://bugs.debian.org/> instead, where the Debian
preview-latex-style package maintainer will receive it.  He will
eventually forward your report upstream if he thinks it related to the
preview-latex upstream sources rather than specific to the
preview-latex-style package for Debian.

If you think that your bug report is not specifically related to the
Debian package and would like to send it directly to the preview-latex
upstream developers, abort this bug reporting procedure now and follow
the usual bug reporting upstream conventions of preview-latex (look in
the preview-latex-style documentation directory
"/usr/share/doc/preview-latex-style/").