Definition lists
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what
    Definition lists associate a term with a definition.

how
    The term is a one-line phrase, and the definition is one
    or more paragraphs or body elements, indented relative to
    the term.

term 1
    Definition 1.

term 2
    Definition 2, paragraph 1.

    Definition 2, paragraph 2.

term 3 : classifier
    Definition 3.

term 4 : classifier one : classifier two
    Definition 4.