An important feature of the present invention consists in the discovery that certain of {HEAD ~ the output signals} in the pattern shown in FIG 5 can be grouped into {TAIL ~ a recognition pattern} as indicated at 54 
grouped into
An important feature of the present invention consists in the discovery that certain of { HEAD ~ the output signals } in the pattern shown in FIG 5 can be grouped into { TAIL ~ a recognition pattern } as indicated at 54
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 OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH