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