GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
3 12 1 1 1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 -1 -1 -1 0 0 0 0 0 0 0 0 0 1 1 1 -1 -1 -1 inequalities 1 12 1 1 1 1 1 1 1 1 1 1 1 1 signs 1 12 1 1 1 1 1 1 1 1 1 1 1 1 grading