Great triangular double tetraswirltegum

The triangular double tetraswirltegum is a convex isochoric polychoron with 72 identical cells. It is the fourth in an infinite family of isochoric triangular tegmatic swirlchora.

Each cel of this polychoron has mirror symmetry, with 1 octagon, 4 hexagons, 6 tetragons, and 2 triangles for faces.