Looking in detail at that shown in Fig. , the associated structures of this polytopal rearrangement sequence are given in Fig. along with their annotated directed graph representation. There are some superficial similarities to the cycle shown in Fig. . Both feature two orientation permutations each of T-4-R and T-4-S, and both feature square planar SP-4 polytopes. The latter, however, does not include the tetragonally elongated tetrahedral TET-4 or symmetric linear SL-4 polytope species associated with the higher energies. Additionally, the positional relationships of. the orientation permutations within the cyclic sequences shown in Fig. and Fig. are different. Fig. shows the polytopal rearrangement sequence for the trajectory depicted in Fig. . As with the cyclic trajectory given in Fig. , this cyclic sequence is also centred on the symmetric linear SL-4-4 species. It does not include any tetrahedral T-4 species but does include four orientation permutations of two lower symmetry twisted tetrahedral TT-4 species. The positional relationships of the orientation permutations within the cyclic sequence are the same as for Fig. (all pairs diametrically opposite).