/usr/lib/python3/dist-packages/Cython/Includes/cpython/ is in cython3 0.25.2-1.
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/usr/lib/python3/dist-packages/Cython/Includes/cpython/__init__.pxd
/usr/lib/python3/dist-packages/Cython/Includes/cpython/array.pxd
/usr/lib/python3/dist-packages/Cython/Includes/cpython/bool.pxd
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/usr/lib/python3/dist-packages/Cython/Includes/cpython/cobject.pxd
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/usr/lib/python3/dist-packages/Cython/Includes/cpython/weakref.pxd