• Start from RURmDvRvUvLvUm
• Position it such that the box is in the North-East tile of the 2x2 square of tiles
• Rotate 180 degrees with a mountain fold the pair of adjacent tiles in the South of the 2x2 square
• The resulting 3D structure admits a hinging and a rotation by opening the two stacked tiles on the West about the West side
• After a 90 degrees rotation we obtain a 3D structure contained in a 1x1x2 box
• Turn 90 degrees a flap tile in the final shape