Assertion: polyhedron's face | /r/CapableOf | connect the 4-sided faces
Facets:
value: at each n-fold vertex
type: LOCATION
Source sentences:
text: Each face of X is separated from all its neighbors and reconnected with a new 4-sided face, corresponding to an edge of X. An n-gon is then added to connect the 4-sided faces at each n-fold vertex.