A method of forming a semiconductor memory device formed on a semiconductor substrate with {TAIL ~ an N well} and {HEAD ~ a P well} comprises the following steps 
A method of forming a semiconductor memory device formed on a semiconductor substrate with { TAIL ~ an N well } and { HEAD ~ a P well } comprises the following steps
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH