20x15 puzzle
Time:
10 4
2
1
7 3
5
2
5
2
5
2
5
2
2
2
4
2
4
2
3
2
4
2
3
1
4
1
3
2
1
1
2
1
1
1 2 1
 
4
13
17
3  2
1  1
8
17
1  4  7
2  4  7  2
1  4  2  1  1  4
 
 
 
 
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