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1    2    3    4   

   1                                    2                                     3                                     4     


5    6    7    8   

       5                                    6                                     7                                    8         


9    10    11    12   

       9                                  10                                  11                                  12         


13    14    15    16   

       13                                 14                                  15                                  16         


17    18    19    20   

       17                                 18                                  19                                  20         


21    22    23    24   

       21                                 22                                  23                                  24         


25    26    27    28   

       25                                 26                                  27                                  28         


29    30    31   

29                                   30                                   31




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