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Fill the board so every row, column, and box contains 1-9
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9
.
2
.
4
.
.
.
3
8
.
7
9
1
3
2
5
6
5
.
3
2
.
8
1
.
.
2
7
.
5
.
.
.
9
4
3
5
4
8
.
.
7
1
2
6
.
.
.
2
.
.
.
5
4
2
.
.
8
9
.
3
.
7
3
5
1
6
.
9
.
8
1
8
9
.
5
2
4
6
.
1
2
3
4
5
6
7
8
9
Erase