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