Thus, the indices are used to find the rows that may match {HEAD ~ one or more portions} of the particular term being queried or, in other words, eliminate those records that do not have {TAIL ~ at least a portion} of the term to be matched 
Thus , the indices are used to find the rows that may match { HEAD ~ one or more portions } of the particular term being queried or , in other words , eliminate those records that do not have { TAIL ~ at least a portion } of the term to be matched
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH