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