15x20 puzzle
Time:
1
1
8 12 11
1
11 11 4
5
10 1
9
1
8
2
1
3
1
3
1
 
1  1  1
3
2
2
3
5
8
9
10
5  3
9
10
11
10
1  6
1  1  1
2
 
 
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