GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
amb_space 9 equations 7 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 congruences 4 sparse 1:1 10:2; 3:1 10:2; 7:1 10:2; 9:1 10:2; grading sparse 1:1 2:1 3:1;