Periodically, {HEAD ~ the Centralized Secure Database} 101 is synched with {TAIL ~ Administrator Database} 104 and each Investigator Database 106 
is synched with
Periodically , { HEAD ~ the Centralized Secure Database } 101 is synched with { TAIL ~ Administrator Database } 104 and each Investigator Database 106
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH