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**U***-
As a polygon, U represents a horogon, or polygon with a shortchord square
of four.

Horogons occur as tilings in Euclidean space.

The polygon xUo is the primitive of the comb product. **Uniform ***- A class of polytope that is symmetry transitive on the vertices and of equal edges: also hight edge-uniform.
*Uniform-face*- The figures whose symmetry is transitive on the faces. These are the duals of the uniform figures. Uniform-faced figures are the duals of the uniform figures.

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