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### 2.2. Sectioning commands

The standard LaTeX document classes (i.e., article, report, and book) contain commands and environments to define the different hierarchical structural units of a document (e.g., chapters, sections, appendices). Each such command defines a nesting level inside a hierarchy and each structural unit belongs to some level.

A typical document (such as an article) consists of a title, some sections with probably a multilevel nested substructure, and a list of references. To describe such a structure the title-generating command \maketitle, sectioning commands such as \section and \subsection, and the thebibliography environment are used. The commands should be correctly nested. For example, a \subsection command should be issued only after a previous \section.

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