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Step by step example of solving a sudoku puzzle
Step 19   Let’s look at the top middle box (where ABC cross MNO). We can’t put a 5 in cell BN because there’s a 5 in cell BQ. Remember, a sudoku column must contain all numbers from 1 to 9. Therefore, the only available sudoku cell for the number 5 is CN.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5 4 2
    9
6   1
1 9 7
4   6
2 Step19: 5 3
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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