a second impurity diffusion region in {TAIL ~ the peripheral region} adjacent to {HEAD ~ the third gate electrode} 
a second impurity diffusion region in { TAIL ~ the peripheral region } adjacent to { HEAD ~ the third gate electrode }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD