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