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