For everyone as mentally-slow as I am, today, this is three levels of events:

30040 the book: More of Aesop's Fables

300040 the chapter: The Crow and the Pitcher

30041 the verse/paragraph: A CROW PERISHING

30041 the verse/paragraph: Necessity is...

Alexandria can currently handle 5 levels of 30040s and a 30041. So, six levels to the hierarchy in the Table of Contents. (More than enough for any Bible. We checked. 😅 )