In the conduction layer, one insulation portion and {HEAD ~ one insulation portion} allowing charge tunneling are formed with {TAIL ~ the barrier layer} in between 
In the conduction layer , one insulation portion and { HEAD ~ one insulation portion } allowing charge tunneling are formed with { TAIL ~ the barrier layer } in between
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH