A column structure in {HEAD ~ accordance} 7 wherein {TAIL ~ the polygonal perimeter} of the column is a regular equiangular and equilateral polygon 
A column structure in { HEAD ~ accordance } 7 wherein { TAIL ~ the polygonal perimeter } of the column is a regular equiangular and equilateral polygon
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH