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25. Fold the other three corners to the center.
26. Fold the bottom edge up, this time do not fold all the way up to the middle, leave a small gap of 1-2 mm.
27. Fold the top edge down, leaving the same 1-2mm gap.
28. Unfold the previous two steps.
29. Fold the left and right edges to the middle, leaving the same 1-2mm gap from the middle.
30. Unfold the previous step.
31. Open out the left and right flaps.
32. Re-fold the top and bottom edges.