{TAIL ~ A contact region} between {HEAD ~ the via} and the section of the metal layer may define a crossbar array 
{ TAIL ~ A contact region } between { HEAD ~ the via } and the section of the metal layer may define a crossbar array
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH