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