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