In use, the block may be made to form vertical or set back walls without pins or other securing mechanisms as {HEAD ~ a result} of {TAIL ~ the high mass} per front surface square foot 
of
In use , the block may be made to form vertical or set back walls without pins or other securing mechanisms as { HEAD ~ a result } of { TAIL ~ the high mass } per front surface square foot
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH