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Experiment Mystery Notebook 6-pack Notebook Style_Theory plans for efficient propulsion systemsSurprise yourself with a little notebook mystery and snag a discount in the process! You get to pick the kind of paper (lined, dot grid, or some of each kind) and we'll do the rest. Each mystery pack contains 6 unique notebooks with the type of paper you select. Mixed packs will be 3 dot grid and 3 lined notebooks. If you have ordered this mystery pack in the past, please let us know and we will be sure your order includes different and unique