Joined triangular duotegum

The joined triangular duotegum is a convex isochoric polychoron and member of the family of joined duotegums with 18 notches as cells.

Isogonal derivatives
Substitution by vertices of these following elements will produce these convex isogonal polychora:
 * Notch (18): Rectified triangular duoprism
 * Isosceles triangle (18): Rectified triangular duoprism
 * Isosceles triangle (36): Semi-uniform hexagonal duoprism
 * Edge (6): Triangular duotegum
 * Edge (9): Triangular duoprism
 * Edge (36): Triangular duoexpandoprism
 * Vertex (6): Triangular duotegum
 * Vertex (9): Triangular duoprism