- foo
  - bar
    - baz
      - boo


----------

(Document
  (List None None
    (ListItem None
      (Paragraph
        'foo')
      (List None None
        (ListItem None
          (Paragraph
            'bar')
          (List None None
            (ListItem None
              (Paragraph
                'baz')
              (List None None
                (ListItem None
                  (Paragraph
                    'boo'))))))))))
