selecting {HEAD ~ templates} of a biometric corpus as one or more speaker identity candidates for {TAIL ~ a probe} based on the prototypes 
selecting { HEAD ~ templates } of a biometric corpus as one or more speaker identity candidates for { TAIL ~ a probe } based on the prototypes
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH