How to make a 3x3 matrix origami base

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1st picture of 3x3 matrix origami base

01.

Start with the backside of the paper facing up.

Prepare to apply a horizontal "Z-fold" and then unfold.

2nd picture of 3x3 matrix origami base

02.

Apply the horizontal "Z-fold" of the step #1 and then unfold.

Prepare to apply a vertical "Z-fold" and then unfold.

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