{HEAD ~ The back wall} 39 is between {TAIL ~ the side walls} and is generally at right angles to each of the side walls 47, 38 
is between
{ HEAD ~ The back wall } 39 is between { TAIL ~ the side walls } and is generally at right angles to each of the side walls 47 , 38
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH