/usr/share/ is in notmuch-emacs 0.21-3ubuntu2.
This file is owned by root:root, with mode 0o755.
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/usr/share/emacs/site-lisp/notmuch/coolj.el
/usr/share/emacs/
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/usr/share/doc/
/usr/share/doc/notmuch-emacs/
/usr/share/doc/notmuch-emacs/copyright
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/usr/share/doc/notmuch-emacs/NEWS.Debian.gz