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==Example ==
<!-- Image with unknown copyright status removed: [[Image:Butterfly_network.gif|thumb|Butterfly Network.]] -->
In the butterfly network, there are two sources (at the top of the picture), each having knowledge of some value A and B. There are two destination nodes (at the bottom), which each want to know both A and B. Each edge can carry only a single value (we can think of an edge transmitting a bit in each time slot).
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