CoCalc -- min.51

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

⁵⁶¹⁰⁶⁹ views

#g2
4
0 -1 0 0 
1 -1 0 0 
0 0 0 -1 
0 0 1 -1 
4
0 0 -1 1 
0 0 0 1 
0 -1 0 0 
-1 0 0 0 
2^1  * 3^2   = 18 % order of the group