  1. ordered
  2. ...
     * unordered
     * ...
  3. end

  * unordered
  * ...
    1. ordered
    2. ...
  * end

  * unordered
  * ...
    1. ordered
    2. code: 
           
           a
           b
           c

    3. ...
       1. ordered
       2. code: 
              
              d
              e
              f

       3. ...
    4. end
  * end

