/usr/share/pyshared/ffc/tensor/ is in python-ffc 1.0.0-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/pyshared/ffc/tensor/__init__.py
/usr/share/pyshared/ffc/tensor/costestimation.py
/usr/share/pyshared/ffc/tensor/geometrytensor.py
/usr/share/pyshared/ffc/tensor/monomialextraction.py
/usr/share/pyshared/ffc/tensor/monomialintegration.py
/usr/share/pyshared/ffc/tensor/monomialtransformation.py
/usr/share/pyshared/ffc/tensor/multiindex.py
/usr/share/pyshared/ffc/tensor/referencetensor.py
/usr/share/pyshared/ffc/tensor/tensorgenerator.py
/usr/share/pyshared/ffc/tensor/tensoroptimization.py
/usr/share/pyshared/ffc/tensor/tensorreordering.py
/usr/share/pyshared/ffc/tensor/tensorrepresentation.py