{HEAD ~ A second semiconductor well} of the first conductivity type is disposed in {TAIL ~ the first semiconductor well} 
is disposed in
{ HEAD ~ A second semiconductor well } of the first conductivity type is disposed in { TAIL ~ the first semiconductor well }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL