7 4
0 0 1 0
0 1 1 0
1 0 1 0
1 1 1 0
 0 0 -1 1
-1 0  0 1
-2 0  1 1
integral_closure

1 4
0 0 0 1
dehomogenization

1 4
1 1 1 0
grading