{TAIL ~ The comonomer} may be a nonpolar, ionic, polar comonomer or {HEAD ~ mixtures} of such monomers 
{ TAIL ~ The comonomer } may be a nonpolar , ionic , polar comonomer or { HEAD ~ mixtures } of such monomers
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH