891011            
                 5         146 147      
                  191615  145   148149150151  
                          144       152 
                       154 153   
                                    
                    2726            
                             156  158   
                  
                                     
      
           
    102  
                                     
                
      126  128  132133                  
                                     
    141140139138137 135