• Start from RRURmRvRvRmU
• Close the bridge on one side (east) and rotate 90 degrees counterclockwise in order to obtain a 3x2 rectangle with a stack of three tiles in the North-West position with the top one (third floor) of type backslash and connected to the Central-West tile
• Open by hinging the stack about the South side (first-second floor) and the West side (second-third floor) into the final shape