Assertion: tetrahedron's vertex | /r/HasProperty | intersection points
Facets:
Source sentences:
text: : tetrahedron with vertexes (0,0,0), (1,0,0), (1,1,0) and (1,1,1) - the 2nd and 3rd vertexes are intersection points, or take a half of a regular tetrahedron as another example/.