Additionally, {TAIL ~ the housing} 12 includes {HEAD ~ an inlet} 15 for receiving an assist gas, which is typically air 
Additionally , { TAIL ~ the housing } 12 includes { HEAD ~ an inlet } 15 for receiving an assist gas , which is typically air
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH