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