<ul>
<li>Start from RRmRmULURmRm
<li>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
<li>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
<li>Obtain the final shape
</ul>