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Permalink In reply to by Samuel (not verified)

Consider the following simple case: six letters and two wires.

You can't just say 6 * 5 * 4 * 3, because that would consider "wire 1 connects A to B / wire 2 connects C to D" and "wire 1 connects C to D / wire 2 connects A to B" as distinct choices while they are actually the same.

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