{TAIL ~ code} for designating {HEAD ~ the second set} of candidates as the plurality of information extractors 
{ TAIL ~ code } for designating { HEAD ~ the second set } of candidates as the plurality of information extractors
TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH