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