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