• Start from RmRmRvLmRvRvLmRv
• Close it in a 3x1 vertical rectangle made of a stack of four tiles in the lowest position and two stacks of two tiles
• Open it vertically in a 3x2 rectangle with two stacks of two tiles in the lowest row
• Turn up 90 degrees the top tile of the right stack of two tiles about its left vertical side (valley fold). Note: act specularly from now on if this move is not possible
• Turn down 90 degrees the bottom tile of the left stack into the final shape