{HEAD ~ A communication data} set together with the data trace is stored as {TAIL ~ a data set} that is retrievable by authorized persons 
is stored as
{ HEAD ~ A communication data } set together with the data trace is stored as { TAIL ~ a data set } that is retrievable by authorized persons
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH