Triangular-heptapetic duoprism

The triangular-heptapetic duoprism or trihop is a convex uniform duoprism that consists of 3 heptapetic prisms and 7 triangular-hexateric duoprisms. Each vertex joins 2 heptapetic prisms and 6 triangular-hexateric duoprisms. It is a duoprism based on a triangle and a heptapeton, and is thus also a convex segmentozetton, as a heptapeton atop heptapetic prism.

Vertex coordinates
The vertices of a triangular-heptapetic duoprism of edge length 1 are given by:
 * $$\left(±\frac12,\,-\frac{\sqrt3}{6},\,±\frac{1}{2},\,-\frac{\sqrt{3}}{6},\,-\frac{\sqrt{6}}{12},\,-\frac{\sqrt{10}}{20},\,-\frac{\sqrt{15}}{30},\,-\frac{\sqrt{21}}{42}\right),$$
 * $$\left(0,\,\frac{\sqrt3}{3},\,±\frac{1}{2},\,-\frac{\sqrt{3}}{6},\,-\frac{\sqrt{6}}{12},\,-\frac{\sqrt{10}}{20},\,-\frac{\sqrt{15}}{30},\,-\frac{\sqrt{21}}{42}\right),$$
 * $$\left(±\frac12,\,-\frac{\sqrt3}{6},\,0,\,\frac{\sqrt{3}}{3},\,-\frac{\sqrt{6}}{12},\,-\frac{\sqrt{10}}{20},\,-\frac{\sqrt{15}}{30},\,-\frac{\sqrt{21}}{42}\right),$$
 * $$\left(0,\,\frac{\sqrt3}{3},\,0,\,\frac{\sqrt{3}}{3},\,-\frac{\sqrt{6}}{12},\,-\frac{\sqrt{10}}{20},\,-\frac{\sqrt{15}}{30},\,-\frac{\sqrt{21}}{42}\right),$$
 * $$\left(±\frac12,\,-\frac{\sqrt3}{6},\,0,\,0,\,\frac{\sqrt{6}}{4},\,-\frac{\sqrt{10}}{20},\,-\frac{\sqrt{15}}{30},\,-\frac{\sqrt{21}}{42}\right),$$
 * $$\left(0,\,\frac{\sqrt3}{3},\,0,\,0,\,\frac{\sqrt{6}}{4},\,-\frac{\sqrt{10}}{20},\,-\frac{\sqrt{15}}{30},\,-\frac{\sqrt{21}}{42}\right),$$
 * $$\left(±\frac12,\,-\frac{\sqrt3}{6},\,0,\,0,\,0,\,\frac{\sqrt{10}}{5},\,-\frac{\sqrt{15}}{30},\,-\frac{\sqrt{21}}{42}\right),$$
 * $$\left(0,\,\frac{\sqrt3}{3},\,0,\,0,\,0,\,\frac{\sqrt{10}}{5},\,-\frac{\sqrt{15}}{30},\,-\frac{\sqrt{21}}{42}\right),$$
 * $$\left(±\frac12,\,-\frac{\sqrt3}{6},\,0,\,0,\,0,\,0,\,\frac{\sqrt{15}}{6},\,-\frac{\sqrt{21}}{42}\right),$$
 * $$\left(0,\,\frac{\sqrt3}{3},\,0,\,0,\,0,\,0,\,\frac{\sqrt{15}}{6},\,-\frac{\sqrt{21}}{42}\right).$$
 * $$\left(±\frac12,\,-\frac{\sqrt3}{6},\,0,\,0,\,0,\,0,\,0,\,\frac{\sqrt{21}}{7}\right),$$
 * $$\left(0,\,\frac{\sqrt3}{3},\,0,\,0,\,0,\,0,\,0,\,\frac{\sqrt{21}}{7}\right).$$