This cycle of operation is repeated after {HEAD ~ each polymerization} run without opening {TAIL ~ the reactor} 
run without opening
This cycle of operation is repeated after { HEAD ~ each polymerization } run without opening { TAIL ~ the reactor }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL