A fourth array of bitlines and {TAIL ~ channel regions} is formed in {HEAD ~ the third thin film polysilicon layer} 
A fourth array of bitlines and { TAIL ~ channel regions } is formed in { HEAD ~ the third thin film polysilicon layer }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD