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