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