{HEAD ~ The R and R groups} in the dicarboxylic acid may be {TAIL ~ an alkylene} or an arylene moiety having from 3 to 34 carbon atoms in one embodiment, in one aspect from 4 to 20 carbon atoms, and in a further aspect from 4 to 9 
be
{ HEAD ~ The R and R groups } in the dicarboxylic acid may be { TAIL ~ an alkylene } or an arylene moiety having from 3 to 34 carbon atoms in one embodiment , in one aspect from 4 to 20 carbon atoms , and in a further aspect from 4 to 9
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH