{HEAD ~ The three dimensional crossbar array} may include {TAIL ~ an insulator layer} and a metal layer, or alternatively, a plurality of alternating insulator and metal layers disposed adjacent each other 
include
{ HEAD ~ The three dimensional crossbar array } may include { TAIL ~ an insulator layer } and a metal layer , or alternatively , a plurality of alternating insulator and metal layers disposed adjacent each other
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH 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