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