{HEAD ~ Any polyetherimide} that was present in {TAIL ~ the mixture} was part of the copolymer otherwise it would have remained soluble in the methylene chloride 
present in
{ HEAD ~ Any polyetherimide } that was present in { TAIL ~ the mixture } was part of the copolymer otherwise it would have remained soluble in the methylene chloride
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH