           
                         
                                                                                                                                                                                                                                     
              
      1        
      2       
      3         
      4                   
                   
       1                              8                      50                
      2                                                                                                              
      3                                 1     9          
      4                            1           4                   
                       
    5                                   c        e          b                    
    6        20                                                                                               
    7                                              
                                                                                 
                                                                                                            
                       
         15849494025   15849494049 
    qq              64730032