<ol>
<li>Start from RRURDLDU ,
<li>place it with the missing corner at the north-west position
    and the south-west tile of "backslash" type.
<li>turn up 180 degrees (valley fold) the right column of three tiles about a vertical line
<li>Open in RUmRDmUmDvDmDv
<li>rotate clockwise 90 degrees the flap in the back against the front flap
<li>change the hinging side and open
<li>Turn two tiles in the final shape
</ol>