Creating a back button to return to the last slide viewed

Hello all...I love this method of finding information!

Here's what I'm trying to do...I have a button REVIEW on several slides that will take a user to a slide REVIEW.  I want to put a button BACK that will take the user back to the last slide viewed.  This may not be a linear move.  They can reach the REVIEW slide from any point in the presentation, basically, and when they click BACK, I want them to be able to go back to the slide they had just clicked off.  I think it can be done with variables, but my thought train has crashed in my cranium.

Ideas?

Thanks much,  Lisa

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