{HEAD ~ a second gate electrode} of a second MOS transistor of a second conductivity type formed on said primary surface of {TAIL ~ said substrate} 
{ HEAD ~ a second gate electrode } of a second MOS transistor of a second conductivity type formed on said primary surface of { TAIL ~ said substrate }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL