Small retroditetrahedronary dishecatonicosihexacosichoron

The small retroditetrahedronary dishecatonicosihexacosichoron, or sradditdahix, is a nonconvex uniform polychoron that consists of 120 ditrigonary dodecadodecahedra, 600 tetrahedra, and 120 small dodecicosidodecahedra. Four ditrigonary dodecadodecahedra, four tetrahedra, and twelve small dodecicosidodecahedra join at each vertex.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the small ditetrahedronary hexacosihecatonicosachoron.