Small retrofrustary pentisicositetrachoron

The small retrofrustary pentisicositetrachoron, or sirfopi, is a nonconvex uniform polychoron that consists of 24 quasirhombicuboctahedra, 24 great cubicuboctahedra, 24 small cubicuboctahedra, 24 small rhombicuboctahedra, and 24 cuboctatruncated cuboctahedra. Two quasirhombicuboctahedra, two great cubicuboctahedra, two small cubicuboctahedra, two small rhombicuboctahedra, and four cuboctatruncated cuboctahedra join at each vertex.

It has the same cell counts as the great retrofrustary pentisicositetrachoron, but the quasirhombicuboctahedra, great cubicuboctahedra, small cubicuboctahedra, and small rhombicuboctahedra are in different positions.

Vertex coordinates
Its vertices are the same as those of its regiment colonel, the antifrustary distetracontoctachoron.