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