20x15 puzzle
Time:
2
6
2
6
2
5
1
5
1
4
1
6
1
4
1
1
4
1
3
1
2
1
2
1
1
3
1
3
1
3
1
4
1
4
1
4
6 6 6
15
3
 
 
 
 
 
 
1
2  1  1  5
4  1  3
8  6
9  9
20
20
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