{TAIL ~ Conventional spinning apparatus} commonly used to form {HEAD ~ fibers} of polyethylene terephthalate conveniently may be selected 
{ TAIL ~ Conventional spinning apparatus } commonly used to form { HEAD ~ fibers } of polyethylene terephthalate conveniently may be selected
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH