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