Returns a HashTable with the faces of a polyhedral object sorted by codimension. The faces are given as lists containing the indices of the rays/vertices of the original object contained in the face.
i1 : fC = faces hypercube 2
o1 = HashTable{0 => {({0, 1, 2, 3}, {})} }
1 => {({0, 2}, {}), ({1, 3}, {}), ({0, 1}, {}), ({2, 3}, {})}
2 => {({0}, {}), ({2}, {}), ({1}, {}), ({3}, {})}
3 => {}
o1 : HashTable
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i2 : fC#1
o2 = {({0, 2}, {}), ({1, 3}, {}), ({0, 1}, {}), ({2, 3}, {})}
o2 : List
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