13. The system of claim 12 , further comprising a ranking module for: ranking each cluster relative to one another if at least two clusters are identified; ranking each aggregate cluster relative to one another if at least two aggregate clusters are generated; and ranking each cluster and each aggregate cluster relative to each other if at least one cluster is identified and at least one aggregate cluster is generated.
12. The system of claim 8 , further comprising generating at least one additional aggregated cluster according to the same steps if the additional aggregated cluster satisfies the predetermined combining criterion, the aggregated cluster and the additional aggregated cluster being distinct from one another.