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9. Unfold the previous step.
10. Fold the bottom left corner up to the top right corner.
11. Unfold the previous step.
12. Flip the paper over to the other side.
13. Bring the bottom left and top right corners forward and down, collapsing the top.
14. Rotate the paper so that the open end is at the bottom.
15. Fold the left and right lower diagonal edges inwards to align with central vertical crease.
16. Unfold the previous step.