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