15x15 puzzle
Time:
8 7 7
1
7 4 1
4
2
2
1
1
3
1
3
1
1
3
1
1
2
3
1
3
2
5 5
1
3  6
3  2
4  2
4  4
4  10
15
6  3
1  4  1
3  2  2
 
 
 
 
 
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