GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
#g3 f4 z2 5x5 0 -1 0 0 0 1 0 0 0 0 0 0 0 -1 0 0 0 1 0 0 0 0 0 0 1 5x5 -1 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 1 5x5 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 -1 5x5 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5x5 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 5x5 0 0 1 -1 0 0 0 1 1 0 1 1 0 0 0 -1 1 0 0 0 0 0 0 0 0 5x5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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 5x5 1 0 0 0 0 1 1 0 0 0 0 -1 1 0 0 0 0 -1 1 1 0 0 0 -1 1 2^4=16 dim5/2-1,2-1;1b