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