{HEAD ~ a first counter} receiving an output of {TAIL ~ said first multiplexer} and outputting a first count signal, 
{ HEAD ~ a first counter } receiving an output of { TAIL ~ said first multiplexer } and outputting a first count signal ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH