Important information about multicast

Hello everybody,
can I ask you one answer?
It's about multicast, in particular communication many to many like videoconference.
The source sends only one stream and there are many source.But how many stream does every source receive? It's important for me!Please help me!

I don't understand.
For example:
I have 3 computers that are source and receiver at the same time (communication many-to-many).
Every one sends one stream but does it receive 2 streams from the others?
Is it wrong?
Thanks

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