COTUS Monographs Division levels
To ensure that similar segments are on the same level across a chapter, create dummy div[1-7,N] elements.
This rule does not include the partFrontMatter or part one.
The structure of the divisions may not always be the same between the TOC and the main text of the book. When there is a conflict, use the structure of the main text.
It is best to work out the chapter with the most levels first, and then use that as a basis for the rest.