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