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