And {TAIL ~ an advantage} of this invention is that it may be advantageously used in parallel to simultaneously preopen two sets of {HEAD ~ profiles} that are attached to the same film 
And { TAIL ~ an advantage } of this invention is that it may be advantageously used in parallel to simultaneously preopen two sets of { HEAD ~ profiles } that are attached to the same film
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH