{TAIL ~ a first impurity diffusion region} in the cell array region between {HEAD ~ the first and second gate electrodes} 
{ TAIL ~ a first impurity diffusion region } in the cell array region between { HEAD ~ the first and second gate electrodes }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD