{HEAD ~ The DOC} 32 oxidizes {TAIL ~ the exhaust} based on the post combustion air/fuel ratio 
oxidizes
{ HEAD ~ The DOC } 32 oxidizes { TAIL ~ the exhaust } based on the post combustion air / fuel ratio
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH