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