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