{TAIL ~ a second phase} changing layer arranged between {HEAD ~ the second voltage application electrode} and the second opposing electrode 
{ TAIL ~ a second phase } changing layer arranged between { HEAD ~ the second voltage application electrode } and the second opposing electrode
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH