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