20x15 puzzle
Time:
3
2
3
2
3
2
3
2
3
2
6 6 6 6 6 4
1
4
1
4
1
6 4
1
4
1
6 6 4
1
4
1
 
 
 
 
 
 
 
 
 
20
20
20
15
10  1  2
20
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