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