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