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