{HEAD ~ Three regions} 33, 34, 35 of a second diffusion type are formed in {TAIL ~ the well} 
are formed in
{ HEAD ~ Three regions } 33 , 34 , 35 of a second diffusion type are formed in { TAIL ~ the well }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL