The reason why I'm asking for this information is because there are editions of Kyoiku and Sounan (single) which feature a kind of 'tabbed' jewel case backing sheet (the piece of paper that is inserted in between the external jewel case and the piece holding the CD itself). They seem to be a set of three. I'm wondering if the Gunjou Biyori single is the third of the set with this feature.
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