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Abstract

When this article is placed on the floor or the like, regardless of whether it is face up or face down, due to the concave-convex structure of the upper and lower parts, one side surface touches the floor and the opposite side surface rises. Therefore, based on the lever principle, it can be inverted, and cards can be inserted and removed from the upper part of the front side of this article in the state shown in the "reference diagram showing the usage state", and it has a structure that allows this article to be stacked on top of each other.

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