N 9
                                           
                                            
                                                  
                                            25  1997 . N 66
   
                          
              , 
              
                  
   
   +---------------------------------------------------------------------+
    N                          -
   /                                 
                                                 (,  
                                                             +---+--------------------+--------------------------------+-----------
    1          2                         3                     4     
   +---+--------------------+--------------------------------+-----------
   1.                       1          
                                   12      
                                                 
                                                                     
   2.               1          
                                   12      
                                                 
                                                   
                                               
                               :                
                                              
                                     1          
                                            1      
                                       12      
                                                   
                                ,                
                                -             
                                  :                
                                         1          
                                           1      
                                       6       
                                                   
                                               
                              :                         
                                  
                                                                     
   3.  -      1          
       ;                  1      
       -                     
                                      
                                                                     
   4.  ()                      
                            1          
                                            1      
                                       12      
                                               
                              :                         
                                  
                                                                     
   5.                            
                                :             
                                    1          
                                   6       
                                                   
                                               
                                :            
                               1  2 
                                              
                                                                     
   6.                                   
                                        
                               :           
                                    1          
                                   12      
                                                 
                                                   
                                ,                   
                              ,             
                                :                    
                                1          
                                           1      
                                       6       
                                                   
                                                                     
   7.                      1          
                       12      
                                   
                                       
                                               
                                :            
                                  
                                           1      
                                                                     
   8.  -                           
                                                
                                                  
                                               
                              :                                  
                                1          
                                       6       
                                                   
                                                                     
   9.               1          
                                            1      
                                   6       
                                               
                              :                         
                                  
                                   
   +---------------------------------------------------------------------+