{TAIL ~ The starting polymers} are preferably {HEAD ~ copolymers} of ethylene and vinyl acetate having stiffness less than about 20,000 psi 
{ TAIL ~ The starting polymers } are preferably { HEAD ~ copolymers } of ethylene and vinyl acetate having stiffness less than about 20,000 psi
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH