Since {HEAD ~ some} of the polymerizations exhibit {TAIL ~ some characteristics} of living polymerizations, block copolymers can be readily made 
exhibit
Since { HEAD ~ some } of the polymerizations exhibit { TAIL ~ some characteristics } of living polymerizations , block copolymers can be readily made
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH