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In page Polyhedron:
"When a line segment connect two vertices that are not in the same face, it forms a diagonal line of the polyhedron.[2] Not all polyhedra have diagonal lines, as in the family of pyramids.[citation needed] The Schönhardt polyhedron has three diagonal lines, all of which lie entirely outside of it, and the Császár polyhedron has no diagonal lines (rather, every pair of vertices is connected by an edge).[3]
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