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