{HEAD ~ a fourth N channel MOS transistor} connected between the other conductive terminal of said fourth P channel MOS transistor and {TAIL ~ the ground potential}, and 
connected between
{ HEAD ~ a fourth N channel MOS transistor } connected between the other conductive terminal of said fourth P channel MOS transistor and { TAIL ~ the ground potential } , and
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH