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