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