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