{TAIL ~ The fugitive gases} and {HEAD ~ the air} enter the engine 101 from the air intake 120 through a control valve 133 
{ TAIL ~ The fugitive gases } and { HEAD ~ the air } enter the engine 101 from the air intake 120 through a control valve 133
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH