The book
The rest of it is in the book.
Understanding, Using, and Maximizing 529 Accounts — 529 30th Anniversary Edition, by C. Richard Hopkins, MD, CRPC® — is published and on sale now. The rest of this rule, and every other rule, worked example and appendix table, is in it.
What you can read here is a sample: a page from each chapter, five of the worked examples, the state guide and the reference tables.
Questions, or a figure that has moved? Write to contact.Total529@gmail.com.