By using {TAIL ~ knowledge} of {HEAD ~ the ranges} of serial numbers , ticket sales can be tracked 
By using { TAIL ~ knowledge } of { HEAD ~ the ranges } of serial numbers , ticket sales can be tracked
OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH