Figure 3.

For the same pair of configurations as in the previous figure (left), two swap moves would be considered, one for each equivalence class (right). Each of the two admissible swap moves consists in swapping the brown cones in one equivalence class with the cyan cones in the same equivalence class. Note that only the memberships in one of the two chain configurations are changed; cone type (not denoted in this figure) and spatial location are unchanged.