[up to this 3D shape]
- Start from I-2
[Nourse] positioned as in the figure and turn it upside-down by
rotating 180 degrees about the North-South axis
- Open and refold into a 2x1 rectangle of two stacks of four tiles in such
a way that the two top tiles (flaps) of the I-2 shape become the two lowest
tiles of the top stack of four tiles
- grab the two highest tiles of both stacks and turn them 180 degrees
to the left obtaining a 2x2 square of stacks of two tiles
- grab the two high tiles of the two southern stacks and turn them down by
rotating of 180 degrees (resulting in a 3x2 rectangle)
- turn the four tiles in the left column 180 degrees and open
in the final shape
