Chapters 4-6, numbered and ordered by the author as follows.
Chapter 4: 107-39.
Chapter 5: 138-9 (numbering repeated), 139X, 139X2, 139A-B, 140, 140A1-2, 141, 141A, 142, 142A, 143, 143A-B, 144-9, 149A, 150-7, (there are no sheets numbered 158-9), 160-79.
Chapter 6: 180-9, 189A-B, 190, 190A, 191-6.