13. Valley over.
14. Valley the side into the pocket.
15. Completed second piece.
16. Precrease the third square in half.
17. Valley the corners to the center.
18. Valley the right edge to the center and precrease the left side in half.
19. Valley the bottom corners.
20. Valley along angle bisectors.
21. Valley along the center.
22. Tuck the side into the pocket.
23. Completed third piece.
24. Precrease the fourth square along the diagonals.