{HEAD ~ A fourth semiconductor region} of the second conductivity type is disposed on the second semiconductor well and in electrical communication with {TAIL ~ the circuit electrode} 
{ HEAD ~ A fourth semiconductor region } of the second conductivity type is disposed on the second semiconductor well and in electrical communication with { TAIL ~ the circuit electrode }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL