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