27.
Let's concentrate on on the region (1) from the step #26.
Prepare for a valley-fold.
Make sure that the valley-fold point should be at 1/6 of the width marked as 1.
28.
Valley-fold according to the step #27.
Prepare to working on the dotted ellipse region.
We will do the same thing on the right edge as we did on the left edge.