dividing the mail thread into respective segments by analyzing the at least two thread body intervals of the thread body field in {HEAD ~ the each} of {TAIL ~ the related e mail messages} 
dividing the mail thread into respective segments by analyzing the at least two thread body intervals of the thread body field in { HEAD ~ the each } of { TAIL ~ the related e mail messages }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL