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Perform one or more Bracha broadcast(s).
The list of senders given will determine the subset of players
who wish to broadcast a message. If this player wishes to
broadcast, its ID must be in the list of senders and the
optional message parameter must be used.
If the list of senders consists only of a single sender, the
result will be a single element, otherwise it will be a list.
A Bracha broadcast is reliable against an active adversary
corrupting up to t < n/3 of the players. For more details, see
the paper "An asynchronous [(n-1)/3]-resilient consensus
protocol" by G. Bracha in Proc. 3rd ACM Symposium on
Principles of Distributed Computing, 1984, pages 154-162.
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