The new paper insert machine fills a gap that has existed in {TAIL ~ the insert machine business} for {HEAD ~ a number} of years 
The new paper insert machine fills a gap that has existed in { TAIL ~ the insert machine business } for { HEAD ~ a number } of years
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH