1 1 2 2 0 0 0 0 
2 1 3 1 0 0 0 0 
4 3 4 2 0 0 0 0 
4 4 3 3 0 0 0 0 
0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0 
0 0 0 0 0 0 0 0