20 11
1 1 0 0 0 0 0 0 0 0 0 
1 -1 0 0 0 0 0 0 0 0 0 
1 0 1 0 0 0 0 0 0 0 0 
1 0 -1 0 0 0 0 0 0 0 0 
1 0 0 1 0 0 0 0 0 0 0 
1 0 0 -1 0 0 0 0 0 0 0 
1 0 0 0 1 0 0 0 0 0 0 
1 0 0 0 -1 0 0 0 0 0 0 
1 0 0 0 0 1 0 0 0 0 0 
1 0 0 0 0 -1 0 0 0 0 0 
1 0 0 0 0 0 1 0 0 0 0 
1 0 0 0 0 0 -1 0 0 0 0 
1 0 0 0 0 0 0 1 0 0 0 
1 0 0 0 0 0 0 -1 0 0 0 
1 0 0 0 0 0 0 0 1 0 0 
1 0 0 0 0 0 0 0 -1 0 0 
1 0 0 0 0 0 0 0 0 1 0 
1 0 0 0 0 0 0 0 0 -1 0 
1 0 0 0 0 0 0 0 0 0 1 
1 0 0 0 0 0 0 0 0 0 -1 
integral_closure