Assertion: tetrahedron's face | /r/CapableOf | intersect in shared vertices
Facets:
Source sentences:
text: Somewhat more generally, Grünbaum defines an acoptic polyhedron to be a collection of simple polygons that form an embedded manifold, with each vertex incident to at least three edges and each two faces intersecting only in shared vertices and edges of each.  
text: Somewhat more generally, Grünbaum defines an to be a collection of simple polygons that form an embedded manifold, with each vertex incident to at least three edges and each two faces intersecting only in shared vertices and edges of each.