a second switching element and {HEAD ~ a third switching element} coupled in series between {TAIL ~ the output} of the first pre buffer and the given terminal and 
a second switching element and { HEAD ~ a third switching element } coupled in series between { TAIL ~ the output } of the first pre buffer and the given terminal and
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH