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The bottom of the boxes is used only in the bottom layer, other boxes do not require bottom. Boxes and bottoms are connected using PP-B clips.
The clips are used to connect the bottom, the bottom with the box and the boxes themselves horizontally and vertically. The connection points at the bottom and box are marked "CLIP". To connect the bottom with the box or two boxes in a vertical position you need 12 pcs clips. When connecting boxes in a vertical way, you need 8 pcs clips.