{TAIL ~ a fifth P channel MOS transistor} connected between {HEAD ~ the other conductive terminal} of each of said third and fourth P channel MOS transistors and the power supply potential 
{ TAIL ~ a fifth P channel MOS transistor } connected between { HEAD ~ the other conductive terminal } of each of said third and fourth P channel MOS transistors and the power supply potential
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH