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• Start from
• Close into a flat shape of five squares contained into a 2x3 rectangle with a missing square in the North-East corner, stacks of two tiles in the South row (tiles at first and second floor) and single tiles in the North row with tiles at second floor
• Open in 3D with hinging about the South side for the South-East stack, hinging about the West side for the South-West stack and valley folds between each North tile and the adjacent tile to the South
• Obtain the final shape