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On receiving a session message,
the agent updates its sequence numbers for all active sources,
and computes its instantaneous distance to the sending agent if possible.
The agent will ignore earlier session messages from a group member,
if it has received a later one out of order.
Session message processing is done in
The format of the session message is:
count of tuples in this message, list of tuples,
where each tuple indicates the
sender id, last sequence number from the source, time the last
session message was received from this sender, time that that message
The first tuple is the information about the local agent