The combination of the front perimeter edge and the seating axis define a front seating area while the combination of the seating axis and {TAIL ~ the rear perimeter edge} define {HEAD ~ a rear seating area} 
The combination of the front perimeter edge and the seating axis define a front seating area while the combination of the seating axis and { TAIL ~ the rear perimeter edge } define { HEAD ~ a rear seating area }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD