Small disnub prismatosnub tetrishexacositetrishexacosichoron

The small disnub prismatosnub tetrishexacositetrishexacosichoron, or sedspostuxtux, is a nonconvex uniform polychoron that consists of 1200 great icosahedra (some of which lie in the same hyperplanes, forming 600 small retrosnub disoctahedra), 1200 great dodecahedra (forming 600 pentagonal retrosnub pseudodisoctahedra), 4800 cuboctahedra (forming 2400 compounds of two), 600 rhombidodecadodecahedra, 600 truncated icosahedra, 600 compounds of 1 small ditrigonal dodecicosidodecahedron and 1 small icosicosidodecahedron, and 3600 pentagrammic prisms.

Two great icosahedra (two compounds), two great dodecahedra (two compounds), eight cuboctahedra (eight compounds), five rhombidodecadodecahedra, five truncated icosahedra, five small ditrigonal dodecicosidodecahedra and five small icosicosidodecahedra (five compounds), and five pentagrammic prisms join at each vertex.

It can be obtained as the blend of 5 small dipentary dishecatonicosihexacosidishecatonicosachora and 5 small dipentary prismatohexacositetrishecatonicosachora.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the small diretrosnub disnub decahecatonicosadishexacosichoron.