Heptagonal duotegum

The heptagonal duotegum, also known as the heptagonal-heptagonal duotegum, the 7 duotegum, or the 7-7 duotegum, is a noble duotegum that consists of 49 tetragonal disphenoids and 14 vertices. It is also the 14-6 step prism. Together with its dual, it is the first in an infinite family of heptagonal dihedral swirlchora.