{HEAD ~ The resulting mixture} is then contacted with {TAIL ~ the co catalyst component} for a shorter second contact time up to 20 seconds 
is contacted with
{ HEAD ~ The resulting mixture } is then contacted with { TAIL ~ the co catalyst component } for a shorter second contact time up to 20 seconds
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH