An amount of {TAIL ~ exhaust} coming out of {HEAD ~ each opening} 48 may be the same or may be different 
An amount of { TAIL ~ exhaust } coming out of { HEAD ~ each opening } 48 may be the same or may be different
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH