                             
           1.                                                       
           2.                                           400    200            
           3.                                                     
           4.                                                                 
           5.                            6  7             
           6.                                   
           7.                                              
           8.                                    
           9.                                                                       
           10.                      
           11.                                             30            
           12.                 6                        
           13.                              
           14.                                
           15.                                        
           16.                                                      250      8          
           17.                                           
           18.    :                                   
           19.                                  