Triggers to unselected slides

I'm trying to create a trigger that will enable the learner to only be sent back to slides they have not seen. For example, I have created a program with 3 scenarios. If the learner chooses scenario #1 first, I only want them to be able to choose scenarios #2 or #3 next. If they choose scenario #3 next, I only want them to be able to choose scenario #2 next. Once they have choosen all scenarios I want them to be sent to a slide that says they have concluded the training. How can I do this?

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