{TAIL ~ a third N channel MOS transistor} connected between the other conductive terminal of said ;{HEAD ~ third P channel MOS transistor} and the ground potential, 
{ TAIL ~ a third N channel MOS transistor } connected between the other conductive terminal of said ; { HEAD ~ third P channel MOS transistor } and the ground potential ,
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH