Assertion: parietal bone's surface | /r/HasProperty | internal
Facets:
Source sentences:
text: The parietal bone has an external and an internal surface.
text: The parietal bone has four borders, four angles, and external/internal surfaces.
text: The parietal bone has an external and an internal surface.
text: The parietal bone has four borders, four angles, and external/internal surfaces.