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