{HEAD ~ The flow} into the exhaust purifying systems may also be controlled according to {TAIL ~ engine speed} 
controlled according to
{ HEAD ~ The flow } into the exhaust purifying systems may also be controlled according to { TAIL ~ engine speed }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL