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