       
                   
                                            ①                                                                                                                                                                                                                                                                                                               
                                                                     
                                                                                                                                  
                                                     
                                                      ②                                                                                                
                                                                                                                                                                                                                     ②                                                                                                                                                                                                                                                         

   
①                                                          
②                                   