{TAIL ~ first and second N channel MOS transistors} connected in parallel between the other conductive terminal of said second P channel MOS transistor and {HEAD ~ a ground potential} 
{ TAIL ~ first and second N channel MOS transistors } connected in parallel between the other conductive terminal of said second P channel MOS transistor and { HEAD ~ a ground potential }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD