15x20 puzzle
Time:
2
6
4
2
5
5
2
2
1
6
4
2
4
12
20 2
17
2
16
2
2
5
8
8
1
4  1
6
4
5
3
4
7
7
8
8
8
1  6
1  5
7
7
7
7
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