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