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