{HEAD ~ The block top surface} has {TAIL ~ one or more protrusions} positioned adjacent the first and second insets on the block top surface 
has
{ HEAD ~ The block top surface } has { TAIL ~ one or more protrusions } positioned adjacent the first and second insets on the block top surface
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH