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