2   Chapter 2 Title (this is also the document title, i.e. H1)

2.1   Section Title

2.1.1   Section Title

2.1.1.1   Section Title

2.1.1.1.1   Section Title

2.1.1.1.2   Section Title2

2.1.1.2   Another Section

2.1.1.3   How the Header is Underlined Makes all the Difference

2.1.2   Section Title

2.1.2.1   Section Title

2.1.2.2   Section Title