Book, Chunks, Parts, Chapters, Sections, Subsections?

BlogBook, Chunks, Parts, Chapters, Sections, Subsections?
Each hierarchical section separated by a string of invisible chars (ASCII 0) of specified length…
User •••••••••••••(13)
Library ••••••••••••(12)
Collection •••••••••••(11)
Set ••••••••••(10)
Volume •••••••••(9)
Book Chunks ••••••••(8)
Cover Matter ••••••••(8)
Front Cover ••••••(7)
Title Page ••••••(7)
Front Matter ••••••••(8)
Title Page ••••••(7)
Publication Page ••••••(7)
Acknowlegements ••••••(7)
Dedication ••••••(7)
Table of Contents ••••••(7)
Forward ••••••(7)
Introduction ••••••(7)
Graph/Photo/Illustration/Map/Timeline ••••••(7)

Body Matter ••••••••(8)
Parts: 1- 5 •••••••(7)
Chapters: 5-10 per Part (all about the same length, start with Chapter Title Case) ••••••(6)
Sections: 3 to 5 per chapter (A-Head Title Case) •••••(5)
Subsections: (B-Head Title Case) ••••(4)
Pages
Page Foot Notes
Paragraphs: •••(3)
Sentences: ••(2)
Phrases: •(1)
Words:
Syllables:
Characters:
Chapter End Notes •••••(5)

Back Matter ••••••••(8)
Book End Notes ••••••(7)
Index ••••••(7)
Glossary ••••••(7)
Bibliography ••••••(7)
List of Illustrations ••••••(7)
Also By This Author ••••••(7)
Recommended By This Author ••••••(7)
About This Author ••••••(7)