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