The process 1 wherein said {HEAD ~ CO oxidation metal} is added to {TAIL ~ said process} through said reaction zone 
is added to
The process 1 wherein said { HEAD ~ CO oxidation metal } is added to { TAIL ~ said process } through said reaction zone
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH