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17. Lift up the edges on the top, right, bottom and left.
18. Fold the bottom and right sections inwards together, collapsing the bottom right corner forward.
19. Bring in the left edge, collapsing the bottom left corner in towards the center.
20. Fold the top edge down, collapsing the top left and right corners.
21. Rotate the model so that it's in a diamond position.
22. On the top section, fold the right side of the flap over to the left.
23. Unfold the previous step.
24. Fold the lower left and right diagonal edges of the top section inwards to align with the central vertical crease.