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