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