15x20 puzzle
Time:
2
8
2
8
2
8
2
8
1
7
1
8
1
7
1
7
1
7
1
7
1
7
1
7
2
7
2
8
2
7
15
4  3
 
 
 
 
 
 
 
 
 
 
4  1  1
15
15
15
15
15
15
15
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