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