CoCalc -- a4.psg

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

⁵⁶³⁶⁴¹ views

   4   2   2   3
   1   2
   4   1
   2   1   4   3       1
   3   4   1   2       1
  -1   1   3   3
   0  -1   0   0
   1   2