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Step by step example of solving a sudoku puzzle
Step 22   Let’s look at the left middle box (where DEF cross JKL). We can’t put 8s in columns K and L because there are 8s in cells CK and HL. Therefore, the only available cell is FJ. This is the only cell that would satisfy sudoku’s general rules.

 
J K L M N O P Q R
A
B
C
D
E
F
G
H
I
5 4 2
    9
6 8 1
1 9 7
4 8 6
2 5 3
3 6 8
1 5 2
4 9 7
2 6  
1 5  
Step22: 8    
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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