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