15x20 puzzle
Time:
9 2
6
2
6
2
3
2
2
4
1
2
6
2
5
2
5
3
5
3
5
3
5
9 4
4
9 9
 
 
 
 
 
 
 
 
 
 
 
15
15
1  7
6  4
12  2
15
3  11
4  10
15
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