How to make a 2D four-pointed origami star

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09.

Turn the paper over.

By using six crease lines, make sure that the existing lines follow the folding map shown on the left.

You need to convert valley-folded (mountain-folded) lines into mountain-folded (valley-folded) lines.

Also you need to add two diagonal valley-folded creases.

10.

Press the paper down while rotating the center to 90 degrees counter-clockwise.

Make sure that the center is popping out.