(3.1)

 

   (3.2)

   (2.1)

     (2.2)
    (2.3)
      (2.4)
 (2.5)

       (2.6)
        (2.7)
  (2.8)
    (1.1a)
    (1.1b)
       (1.2)
        (1.3)