Enneadiminished icosiheptaheptacontadipeton

The enneadiminished icosiheptaheptacontadipeton, or endjak, is a convex scaliform polypeton that consists of 9 triangular duoantifastegia, 18 square tettenes and 6 hexatera. Six triangular duoantifastegia, seven square tettenes, and two hexatera meet each vertex.

It is the convex hull of two perpendicular dual-oriented triangular duoprisms.

Vertex coordinates
The vertices of an enneadiminished icosiheptaheptacontadipeton of edge length 1 are given by:


 * $$\biggl(0,\frac{\sqrt{3}}{3},0,0,0,\frac{\sqrt{3}}{3}\biggr)$$
 * $$\biggl(\pm\frac{1}{2},-\frac{\sqrt{3}}{6},0,0,0,\frac{\sqrt{3}}{3}\biggr)$$
 * $$\biggl(0,\frac{\sqrt{3}}{3},0,0,\pm\frac{1}{2},-\frac{\sqrt{3}}{6}\biggr)$$
 * $$\biggl(\pm\frac{1}{2},-\frac{\sqrt{3}}{6},0,0,\pm\frac{1}{2},-\frac{\sqrt{3}}{6}\biggr)$$
 * $$\biggl(0,0,0,\frac{\sqrt{3}}{3},0,-\frac{\sqrt{3}}{3}\biggr)$$
 * $$\biggl(0,0,\pm\frac{1}{2},-\frac{\sqrt{3}}{6},0,-\frac{\sqrt{3}}{3}\biggr)$$
 * $$\biggl(0,0,0,\frac{\sqrt{3}}{3},\pm\frac{1}{2},\frac{\sqrt{3}}{6}\biggr)$$
 * $$\biggl(0,0,\pm\frac{1}{2},-\frac{\sqrt{3}}{6},\pm\frac{1}{2},\frac{\sqrt{3}}{6}\biggr)$$