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