In step 702, the process randomly selects K clusters of probe match scores 110, averages probe match scores within {HEAD ~ each} of the clusters to obtain {TAIL ~ a mean} as a center, and goes to step 704 
In step 702 , the process randomly selects K clusters of probe match scores 110 , averages probe match scores within { HEAD ~ each } of the clusters to obtain { TAIL ~ a mean } as a center , and goes to step 704
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH