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