(10a)                                                                                  (10b) 
                                                                                                                                                                                                                        (11)                                                     (12a)
 
 
 
 
                                                                                                                                                                                                    
                                                                                                                                           
                                                                                                                                                                                                    
                                                                                                                                                         
 
 
 
 
 
                                (12b)                                                     (12c)                                                      (13)                                                    (14)                                                     (15)