20x15 puzzle
Time:
5
2
4
2
4
1
6
1
6
1
6
1
1
4
1
1
2
1
2
2
2
2
2
1
3
1
4
1
4
1
3
1
4
1
5
1
5
6 6
 
 
 
 
 
8
3  9
7  2
7  2  5
20
20
1  9
4
2
7
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