- ,
()




                    
   
                                                             (. .)
    +-------------------------------------------------------------------+
            
    --                   
                            ( -(. 4 +  
                                  ,  + . 5 -
                                               - . 6) 
                                               .)              
    +-----+-------+---------+-------+-----------+------------+----------
      1     2       3       4       5           6          7     
    +-----+-------+---------+-------+-----------+------------+----------
      1    41    -                                         
         "-  .                                         
           "                                           
                -                                        
                 -                                        
                 -                                        
                                                          
                 ,                                         
                 -                                        
                                                         
    +-----+-------+---------+-------+-----------+------------+----------
      2    42    -                                        
         "- .                                         
          -                                         
         " -                                        
                 -                                        
                                                          
                ,                                         
                 -                                        
                                                          
    +-------------------------------------------------------------------+