CoCalc -- 2-1,2-1;1

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

⁵⁶⁰⁹³⁸ views

#1

5x5
0 0 1 0 0
0 0 1 1 1
1 0 0 0 0
0 1 0 0 0
0 0 0 -1 1

dim5/2-1,2-1;1a