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Step by step example of solving a sudoku puzzle
Step 16   Let’s look at the top left box (where ABC cross JKL). Following our sudoku logic, we can’t put a 4 in row B, because there’s a 4 in cell BM. We can’t put a 4 in cell CK because there’s a 4 in cell CP. Therefore, the only available cell is AK.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5 Step16: 4 2
    9
6   1
1 9 7
4   6
     
3 6 8
1 5 2
4 9 7
2 6  
1 5  
     
7   9
  2  
5   4
  8  
9 3  
2 7  
    5
    8
  1 6
     
3 4  
9 7  
    9
     
8   3



   
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