0 1 2 3 4 5 6 7 8 9 
9 8 7 6 5 4 3 2 1 0 
9 8 7 3 2 1 0 
9 3 2 1 0 
3 2 1 0 
3 2 1 
3 2 1 0 0 
3 2 1