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Step 10: Fold the bottom edge up to the top edge.
Step 11: Pick up the paper and push the sides inwards.
Step 12: Continue collapsing the paper into this position.
Step 13: Flatten the paper, this is called the origami square base.
Step 14: Rotate the square base so that the opening is at the bottom.
Step 15: Imagine that you need three pizza slices. Fold the right diagonal edge over to the left, making a third, make it as equal as possible.
Step 16: Fold the left flap over the top. It should reach the edge of the one underneath. If these flaps are way off, you may need to re-fold the previous step.
Step 17: Unfold the flaps.
Step 18: Squash fold the right flap as shown.