This mixture is then contacted with {HEAD ~ the remainder} of {TAIL ~ the electron donor or transition metal component} for a second contact time of less and 110 seconds 
of
This mixture is then contacted with { HEAD ~ the remainder } of { TAIL ~ the electron donor or transition metal component } for a second contact time of less and 110 seconds
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH