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