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How does a Benes network work? If I have a Benes network with 8 nodes on each side, like this one here:

enter image description here

. . . how do I know whether or not I take the upper or lower port of a switch in each stage? For example, how would I get from node 001 (1) on the left side to node 111 (7) on the right side? Is there a general formula or something?

Thanks for any help clearing this up. It seems simple, but I just don't see it.

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