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