{HEAD ~ a Robertson device} coupled to said first count signal and said second count signal, and having as an output {TAIL ~ a correlation signal} 
having
{ HEAD ~ a Robertson device } coupled to said first count signal and said second count signal , and having as an output { TAIL ~ a correlation signal }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL