- a
 - b
  - c
   - d
    - e


----------

(Document
  (List None None
    (ListItem None
      (Paragraph
        'a'))
    (ListItem None
      (Paragraph
        'b'))
    (ListItem None
      (Paragraph
        'c'))
    (ListItem None
      (Paragraph
        'd\n    - e'))))
