Assertion: császár polyhedron | /r/HasAspect | 21 edges
Facets:
Source sentences:
text: The dual to the Császár polyhedron, the Szilassi polyhedron, was discovered later, in 1977, by Lajos Szilassi; it has 14 vertices, 21 edges, and seven hexagonal faces, each sharing an edge with every other face.