03.
Apply the valley-fold of the step #2 and then unfold.
There are six crease lines on the paper.
Prepare to apply a (1) valley-fold, (2) mountain-fold, (3) valley-fold, (4) mountain-fold in order.
When you are applying the first valley-fold, make sure that the diamond point (located at the end of line A) merged on any point on line D.
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