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