[previous configuration] [up to this 3D shape] [next configuration] ― Configuration code: RRmUmLvDvLmUUv

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• Start from
• Close both flaps against opposite sides (west and east) of the "tube"
• Move lower tile of the East wall towards the lonely tile of the south wall and change their hinging side
• Simultaneously push apart the two lower tiles of the West wall (also changing their hinging side, hence hinging about their upper side, some stretching involved)
• Finally open the flap to obtain the final shape.