{HEAD ~ These structures} 12 and 13, extend upright throughout {TAIL ~ substantially the entire height} of the side wall 11 
extend upright throughout
{ HEAD ~ These structures } 12 and 13 , extend upright throughout { TAIL ~ substantially the entire height } of the side wall 11
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH