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Sudoku 18x18 num: 401 (Level: hard)

2
I
7
B
1
C
B
D
I
8
1
4
2
6
E
G
D
F
7
G
C
A
6
1
H
8
H
F
5
I
8
B
H
D
2
G
7
E
C
7
4
I
2
F
E
C
6
1
B
D
C
9
4
E
C
A
1
H
5
2
7
C
E
5
6
1
5
D
8
C
7
2
1
B
E
9
7
C
A
H
7
8
4
2
I
D
F
3
5
B
3
C
1
D
2
B
5
6
1
C
H
I
B
D
5
2
7
I
2
9
F
4
8
C