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