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