- a
  - b
  - c

- d
  - e
  - f


----------

(Document
  (List None None
    (ListItem None
      (Paragraph
        'a')
      (List None None
        (ListItem None
          (Paragraph
            'b'))
        (ListItem None
          (Paragraph
            'c'))))
    (ListItem None
      (Paragraph
        'd')
      (List None None
        (ListItem None
          (Paragraph
            'e'))
        (ListItem None
          (Paragraph
            'f'))))))
