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