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Yeah, it's a really weird binding system. If you look at the second photo, you see a little yellow page at the top left. It says "MULT-O: Patented" and then has instructions on how to use it. I tried to Google it years ago in hopes to learn more about it and came up dry. I tried again this morning and got the same results. It's an interesting way to bind things, if only the book wasn't so stuffed.