[1]
Start with the white side of the paper facing up. Fold the paper in half vertically, then unfold.
[2]
Fold the top corners inward so that edges AB and BC meet at the center line.
[3]
Valley fold
in half along the center line.
[4]
Starting at point X,
valley fold
downward as shown so that edge XY intersects point Z, which is located at 1/2 the length of the bottom edge.
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