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