The second table is then cleared, and {HEAD ~ the hash values} for the detected connections in the next time period are stored in {TAIL ~ the second table} 
The second table is then cleared , and { HEAD ~ the hash values } for the detected connections in the next time period are stored in { TAIL ~ the second table }
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 REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL