1. Take a RMB 100 first, as shown below.
2. Fold in half, as shown in the figure below.
3. Fold this side down, as shown below.
4. The other side is also folded down, as shown in the figure below.
5. The reverse side is like this, as shown in the figure below.
6. Fold again, as shown in the figure below.
7. Fold into this shape, as shown in the figure below.
8. Conversely, fold the small corner by one third, as shown in the figure below.
9. A small angle is folded outward to form an angle, as shown below.
10, this slot has two corners, as shown in the figure below.
1 1. This joint is used for corner insertion, as shown in the figure below.
12, 8 slots are inserted together and a red line is added, as shown below.