The fuel is passed over the cores and metal particles in {TAIL ~ passing} between {HEAD ~ the inlet} and outlet 
The fuel is passed over the cores and metal particles in { TAIL ~ passing } between { HEAD ~ the inlet } and outlet
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH