  3   20  24        
  
2022/3/21

      3  20  0  24              2             5         2      1    1     

      3  20  24                10     5     1    4         24     19    5          1                               

      2  15                484     432    25     15    4    3    3    2        474     427    25     14    3    3    2  

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