performing {HEAD ~ a similarity measurement} between {TAIL ~ the speaker identity candidate match scores} and probe match scores to obtain similarity values; and 
between
performing { HEAD ~ a similarity measurement } between { TAIL ~ the speaker identity candidate match scores } and probe match scores to obtain similarity values ; and
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH