15x20 puzzle
Time:
3 1
4
3
6
9 6 6
1
6 5 7 1
7
10 7 1
7
10 7
 
 
 
 
 
 
 
 
1
2  1
5  1  1
9  1
13
1  12
13
14
4  7
4  7
4  1  5
1
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