31A.
Impotant notice:
The picture on the left is the folding map for the so called "qudrant folding" of the steps #33-38.
If you will be puzzled at those steps, you can come back to this folding map and apply four mountain folds. Then you will get the step 40 right away.
By studying this mountain-folding on the four blue dotted dash-lines, you can figure out what the alignment of the negative-y and x axes really mean.
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