The hash values for the connections detected during {HEAD ~ a predetermined time period} are stored in {TAIL ~ the first table} 
The hash values for the connections detected during { HEAD ~ a predetermined time period } are stored in { TAIL ~ the first table }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL