 All edges are doubled (making it degenerate), sharing 4 faces, but are considered as two overlapping edges as a topological polyhedron.It can be constructed from the vertex figure 3(5/2.4.3.4), thus making it also a cantellated great icosahedron.The "3" in front of this vertex figure indicates that each vertex in this degenerate polyhedron is in fact three coincident vertices.