Each of {HEAD ~ the side surfaces} has an inset spanning from the block top surface to {TAIL ~ the block bottom surface} 
Each of { HEAD ~ the side surfaces } has an inset spanning from the block top surface to { TAIL ~ the block bottom surface }
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL