means for comparing the first message with the set of {TAIL ~ rules} that are stored in association with {HEAD ~ the first cache} for a match with one or more, and 
means for comparing the first message with the set of { TAIL ~ rules } that are stored in association with { HEAD ~ the first cache } for a match with one or more , and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH