How to make a flat rectangular origami box

(page 9)

15th picture of flat rectangular origami paper box

15.

Apply two 90 degrees mountain-folds of the step #14.

Prepare to apply a 90 degrees mountain-fold.

16th picture of flat rectangular origami paper box

16.

Apply the 90 degrees mountain-fold of the step #15.

Prepare to apply a mountain-fold.

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