{HEAD ~ The first and second sub gates} of the second gate are separated by {TAIL ~ a second intergate dielectric layer} 
are separated by
{ HEAD ~ The first and second sub gates } of the second gate are separated by { TAIL ~ a second intergate dielectric layer }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL