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