GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
7 9 1 1 1 -1 -1 -1 0 0 0 1 1 1 0 0 0 -1 -1 -1 0 1 1 -1 0 0 -1 0 0 1 0 1 0 -1 0 0 -1 0 1 1 0 0 0 -1 0 0 -1 0 1 1 0 -1 0 0 0 -1 1 1 0 0 -1 0 -1 0 0 equations 4 10 1 0 0 0 0 0 0 0 0 2 0 0 1 0 0 0 0 0 0 2 0 0 0 0 0 0 1 0 0 2 0 0 0 0 0 0 0 0 1 2 congruences 1 9 1 1 1 0 0 0 0 0 0 grading