The portion of {TAIL ~ this lock range} in which {HEAD ~ the width} of the lock range decreases is positively utilized 
in
The portion of { TAIL ~ this lock range } in which { HEAD ~ the width } of the lock range decreases is positively utilized
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL REL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH