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