Unit Test: book.020
Chapter 1. First Chapter
This chapter is numbered, so are its sections.
1. First section
1.1. Second section
…
Second Chapter
This chapter is not numbered, neither are its sections.
First section
Second section
Chapter 3. Third Chapter
This chapter is numbered, its sections are not.
First section
Second section
…
Fourth Chapter
This chapter is not numbered, but its sections are.