{TAIL ~ Each} of the end walls has a first end, {HEAD ~ a second end} and a free side from which a horizontal plate extends transversely 
{ TAIL ~ Each } of the end walls has a first end , { HEAD ~ a second end } and a free side from which a horizontal plate extends transversely
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH