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