Sets created without parameters use the default coordinate names.
Alternatively, the coordinates may be specified using a list of names
Or the root variable name for a set of indexed coordinates can be provided.
The facets of a truncated octahedron are triangles and regular hexagons.
The facets of a truncated octahedron are squares and regular hexagons.
The facets of a cuboctahedron are regular triangles and squares.