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4
5
9
1
3
6
4
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6
7
1
5
8
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4
7
3
6
9
2
6
5
9
4
7
9
5
7
9
4
3
2
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4
3
6
5
9
1
6
4
9
7
1
5
8
7
3
2
6
1
3
6
5
9
4
9
7
4
4
7
9
3
9
5
2
1
2
3
4
5
6
7
8
9
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