The initiating constituent is usually present in {HEAD ~ an amount} of {TAIL ~ about 0.05 to about 5 percent} by weight of the copolymer 
of
The initiating constituent is usually present in { HEAD ~ an amount } of { TAIL ~ about 0.05 to about 5 percent } by weight of the copolymer
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH