20x15 puzzle
Time:
3
3
1
6 6 6
1
5 5 5 6 6 7 3
1
5 7 7 6 4 4 3 3 3
 
 
 
 
 
1  3
4  3  8
20
20
16  1
10  4
11  2
1
1
1
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