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