{HEAD ~ A well} 31 having a first diffusion type is formed in {TAIL ~ a substrate} 30 
is formed in
{ HEAD ~ A well } 31 having a first diffusion type is formed in { TAIL ~ a substrate } 30
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH