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