{HEAD ~ The PF} 34 receives exhaust from the DOC 32 and filters any soot particulates present in {TAIL ~ the exhaust} 
{ HEAD ~ The PF } 34 receives exhaust from the DOC 32 and filters any soot particulates present in { TAIL ~ the exhaust }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL