i1 : R=QQ[x_0..x_4];
i2 : addCokerGrading(R); 5 4 o2 : Matrix ZZ <--- ZZ
i3 : grading R o3 = | -1 -1 -1 -1 | | 1 0 0 0 | | 0 1 0 0 | | 0 0 1 0 | | 0 0 0 1 | 5 4 o3 : Matrix ZZ <--- ZZ