In some texts, there are insane attempts to not change numbers between versions. If pages are removed, those page numbers are not used. If text is added, they a

In some texts, there are insane attempts to not change numbers between versions. If pages are removed, those page numbers are not used. If text is added, they add sub-page numbers, like sub-bullets in an outline. Some legal tomes are in binders, not hard-bound, to accommodate this. This leads to page numbers like 247.1151a-iii. Which is then the canonical page number for a block of text. It's enough to make the Library of Congress filing system seem simple and rational!!