|    2|    3
    8|  6 4|9 2  
  4  |  9 3|    7
-----+-----+-----
    6|     |7 8  
     |  7  |     
  7 2|     |3    
-----+-----+-----
8    |6 5  |  9  
  5 1|8 4  |6    
9    |3    |     



  7  |    1|  4  
9   3|6   5|    8
4   1|    9|3   2
-----+-----+-----
3    |  9 7|     
  4 6|     |8 9  
     |8 6  |    5
-----+-----+-----
7   9|5    |2   3
6    |2   8|5   9
  1  |9    |  8  



  7 6|8   3|5 4  
  5  |     |3   1
    2|  4  |    8
-----+-----+-----
6   7|  9 8|     
    1|  5  |8    
     |4 1  |2   6
-----+-----+-----
8    |  3  |7    
2   3|     |  6  
  9 5|2   4|1 8  



    4|  9 7|     
     |  2  |    3
6 2  |  5 3|4   7
-----+-----+-----
  9 1|    6|  5 4
8 5  |     |  3 2
4 3  |5    |9 8  
-----+-----+-----
1   2|7 8  |  4 5
9    |  1  |     
     |2 6  |8    



     |5 2  |  1 7
2 6  |  9 8|    5
     |     |     
-----+-----+-----
  9  |    1|  7  
  1 5|     |4 2  
  8  |6    |  3  
-----+-----+-----
     |     |     
1    |8 5  |  6 4
5 3  |  6 9|