Branching, but still seeing every slide

I want to have some branching in this module, but at the same time, I want every slide visited.  It's exploring a new machine, so what I did was have it to where there were arrows letting you go to different parts of the machine.  These occur in groups of two and then they meet up again at a third slide.

How do I make it to where, let's say, you pick slide 2 first, now, there's an arrow on slide 2 and I want that arrow to take me to slide 1 if I haven't been to it yet, and if I have, take me to slide 3.


Does that make sense?

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