{TAIL ~ The passageway} includes {HEAD ~ a fuel delivery end} located in a firebox and a fuel infeed end below the plate 
{ TAIL ~ The passageway } includes { HEAD ~ a fuel delivery end } located in a firebox and a fuel infeed end below the plate
TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH