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