code for determining {TAIL ~ a second set} of {HEAD ~ candidates} from the first set of candidates who have passed testing procedures; and 
code for determining { TAIL ~ a second set } of { HEAD ~ candidates } from the first set of candidates who have passed testing procedures ; and
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH