a first P channel MOS transistor having one conductive terminal connected to {TAIL ~ the other conductive terminal} of said {HEAD ~ first P channel MOS transistor}, and 
a first P channel MOS transistor having one conductive terminal connected to { TAIL ~ the other conductive terminal } of said { HEAD ~ first P channel MOS transistor } , and
OTH 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