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