{TAIL ~ The method,1}, wherein said difference count and said pulse count are stored separately on the occurrence of a pulse of {HEAD ~ said second series} in first and second storage means, respectively 
{ TAIL ~ The method,1 } , wherein said difference count and said pulse count are stored separately on the occurrence of a pulse of { HEAD ~ said second series } in first and second storage means , respectively
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH