Section 9.6, page 8. For copies produced prior to November, 2023, the second sentence of the fourth paragraph is incorrect. It should read, "It is impossible
to overstate the importance of this invention."
Figure 2-10. For copies produced prior to September, 2023, the caption on Figure 2-10 is incorrect. It should read, "Computation of OR using NAND gates." The table and accompanying text are correct. The date is found at the bottom of the copyright page.