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1. First, take out one of the square papers.
2. Fold and unfold along the two diagonal lines and the center line respectively.
3. Fold the four corners to the center point respectively.
4. Fold the two sides of the above-mentioned folded object to the center line respectively, and then unfold it.
5. Unfold any pair of diagonal corners of the four corners folded in step 3.
6. Fold the triangles with the opposite corners of the unfolded pair down according to the dotted line drawn above, and then unfold them.
7. Fold any place along the center line.
8. Fold the other part on the same side in the same way and then fold it inward.
9. Fold the other two places on the other side in the same way as 7 and then fold it in the same way as
10. Stick the middle with transparent tape for fixing.
11. Turn to the back and pinch out the four sides of the square with your hands.
12.Fold another square piece of paper in the same way as 1-11.
13. Use the small as the "box" and the large as the "lid".
