The method 1 where said forcing step is simultaneously performed on two sets of {HEAD ~ profiles} attached to {TAIL ~ said film} 
attached to
The method 1 where said forcing step is simultaneously performed on two sets of { HEAD ~ profiles } attached to { TAIL ~ said film }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL