Chapters 19-23, numbered and ordered by the author as follows:
Chapter 19: 443-64.
Chapter 20: 465-71, [471A], 472-89.
Chapter 21: 490-2, 493 (red ink), 493 (second sheet with this number), 494, 494A, 495-508.
Chapter 22: 509-32.
Chapter 23: 533-45, 546-550A (6 sheets grouped together with yellow adhesive note attached: 'Use in F's final explanation'), 551-4.