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― Configuration code: RUmRvDRmDvUmDm
- Start from
- Rotate 90 degrees two adjacent tiles, located along the rectangular tube and furthest from the
two upper tiles in such a way that the angle between them is reverted (from mountain to valley) and
one of the two tiles gets stacked against another tile
- Lift 90 degrees a pair of adjacent tiles (one is the tile mentioned above) into the final shape
