Pre-everything internet™, there were these layered card stock things where you'd have different information and windows on the top layer and you'd slide another piece of paper on text through it (sometimes a circle, sometimes up and down), line up something in one window (e.g., symptoms) and get the results in a second window (e.g., you have poison ivy). What were these called? Is there a simple (like html5 really simple, I am a moron simple) way to remake them online?
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