{HEAD ~ The devices} comprise a body formed of a polymeric backbone having a repeating unit of a hydrocarbon radical and symmetrical dioxycarbon unit with {TAIL ~ a multiplicity} of organic groups bonded thereto 
{ HEAD ~ The devices } comprise a body formed of a polymeric backbone having a repeating unit of a hydrocarbon radical and symmetrical dioxycarbon unit with { TAIL ~ a multiplicity } of organic groups bonded thereto
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH