7. A system according to claim 1 , wherein each spine group comprises one or more of a unique spine of clusters, other cluster spines, and singleton clusters.
1. A system for displaying spine groups, comprising the at least one processor operable to function as: a unique group placement module to place unique spine groups selected from a set of spine groups around a shape defined in a display; a selection module to select one of the spine groups remaining in the set; a comparison module to compare the selected spine group to each of the unique spine groups in the display; an identification module to identify the unique spine group that is most similar to the selected spine group; and a group placement module to place the selected spine group adjacent to the unique spine group that is most similar.