{HEAD ~ each} of gate electrodes of said third and fourth 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 
{ HEAD ~ each } of gate electrodes of said third and fourth 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
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH