Great transitional 13-5 bigyrochoron

The great transitional 13-5 bigyrochoron is a convex isochoric polychoron with 26 identical cells.

Each cell of this polychoron has digonal symmetry, with 2 mirror-symmetric dodecagons, 1 square, 8 irreuglar tetragons, and 4 scalene triangles for faces.