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