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