CoCalc -- 1,1,1,1,1;1

GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

⁵⁶⁰⁹²² views

#1

6x6
0 0 0 0 1 -1
1 0 0 0 0 0
0 1 0 0 0 0
0 0 1 0 0 0
0 0 0 1 0 0
0 0 0 0 1 1