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