Difficulty
: Easy,
Time:
7
8
9
6
1
5
4
7
9
6
1
6
3
8
4
2
1
8
6
3
2
5
8
8
9
5
4
3
2
6
1
9
8
7
5
2
5
8
4
9
3
1
7
3
7
1
5
9
6
8
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