Talk:Small prismatodecachoron

simpler coords of spid are all even sign changes of: and all permutations of the first 3 coordinates of:
 * $$\left(\frac{\sqrt2}{4},\,\frac{\sqrt2}{4},\,\frac{\sqrt2}{4},\,\frac{\sqrt{10}}{4}\right),$$
 * $$\left(±\frac{\sqrt2}{2},\,±\frac{\sqrt2}{2},\,0,\,0\right).$$