{HEAD ~ third and fourth P channel MOS transistors} having {TAIL ~ one conductive terminal} connected to each other, 
having
{ HEAD ~ third and fourth P channel MOS transistors } having { TAIL ~ one conductive terminal } connected to each other ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH