each of {TAIL ~ gate electrodes} of said third and fourth P channel MOS transistors is connected to a connection node between said third P channel MOS transistor and said {HEAD ~ third N channel MOS transistor} 
each of { TAIL ~ gate electrodes } of said third and fourth P channel MOS transistors is connected to a connection node between said third P channel MOS transistor and said { HEAD ~ third N channel MOS transistor }
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD