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/usr/lib/python2.7/dist-packages/sphinxcontrib/actdiag.py is in python-sphinxcontrib.actdiag 0.6.0-1.

This file is owned by root:root, with mode 0o777.

It is a symlink to /usr/lib/python2.7/dist-packages/sphinxcontrib/../../../../share/pyshared/sphinxcontrib/actdiag.py