{HEAD ~ The group} of {TAIL ~ parallel metal lines} in the horizontal direction of the crossbar structure may be realized by stacking alternating layers of metal and insulator, patterning the stacks into stripes, and etching vertically to form mesas that include stacks of isolated horizontal metal lines 
of
{ HEAD ~ The group } of { TAIL ~ parallel metal lines } in the horizontal direction of the crossbar structure may be realized by stacking alternating layers of metal and insulator , patterning the stacks into stripes , and etching vertically to form mesas that include stacks of isolated horizontal metal lines
HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH