{HEAD ~ Each} of {TAIL ~ said side surfaces} has an inset, 22A and 22B, spanning from the block top surface 10 to the block bottom surface 8 
of
{ HEAD ~ Each } of { TAIL ~ said side surfaces } has an inset , 22A and 22B , spanning from the block top surface 10 to the block bottom surface 8
HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH