Decagonal duotegum

The decagonal duotegum, also known as the decagonal-decagonal duotegum, the 10 duotegum, or the 10-10 duotegum, is a noble duotegum that consists of 100 tetragonal disphenoids and 20 vertices. It is also the 20-9 step prism. Together with its dual, it is the first in an infinite family of decagonal dihedral swirlchora and the fourth in an infinite family of square dihedral swirlchora.