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