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