construction notes

<h1>construction notes</h1>

<ul>
<li>from RmRmRvLmRvRvLmRv (symmetric gray box 1x2x3+1)
<li>flatten into flat 1x3 rectangle with one stack of four
(right) and two stacks of 2 (left and middle)
<li>open into a 2x3 (flat) rectangle, place it so that the two stacks of
two tiles are on the right and the prodruding tiles are on top.
<li>turn these two right stacks down 180 degrees with a vertical
mountain fold into a 2x2 (flat) square
<li>turn the square upside-down and lift the tiles into 3D into
the required shape
</ul>