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