forming {HEAD ~ a plurality} of electrically conductive control gates each disposed adjacent to and insulated from one of the channel region {TAIL ~ first portions} for controlling a conductivity of the one channel region first portion; and 
forming { HEAD ~ a plurality } of electrically conductive control gates each disposed adjacent to and insulated from one of the channel region { TAIL ~ first portions } for controlling a conductivity of the one channel region first portion ; and
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH