GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
#g3 f6 z3
6x6
0 -1 0 0 0 0
1 0 0 0 0 0
0 0 0 -1 0 0
0 0 1 0 0 0
0 0 0 0 1 0
0 0 0 0 0 1
6x6
-1 0 0 0 0 0
0 1 0 0 0 0
0 0 0 1 0 0
0 0 1 0 0 0
0 0 0 0 1 0
0 0 0 0 0 1
6x6
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 0
0 0 0 0 0 -1
6x6
1 0 0 0 0 0
0 1 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 0
6x6
0 0 0 0 0 0
0 0 0 0 0 0
0 0 1 0 0 0
0 0 0 1 0 0
0 0 0 0 0 0
0 0 0 0 0 0
6x6
0 0 1 -1 0 0
0 0 1 1 0 0
1 1 0 0 0 0
-1 1 0 0 0 0
0 0 0 0 0 0
0 0 0 0 0 0
6x6
0 0 0 0 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 0
0 0 0 0 0 0
6x6
0 0 0 0 0 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
0 0 0 0 1 0
6x6
0 0 0 0 0 0
0 0 0 0 0 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
6x6
0 0 0 0 1 0
0 0 0 1 1 1
1 0 0 0 0 0
0 1 0 0 0 0
0 0 0 -1 0 1
0 0 1 0 0 0
6x6
0 0 0 0 1 0
0 1 0 0 1 0
0 -1 1 0 0 0
0 0 -1 1 0 1
0 0 0 -1 0 1
1 0 0 0 0 0
6x6
1 0 0 0 0 0
1 1 0 0 1 0
0 0 1 0 0 -1
0 0 0 1 0 0
0 -1 0 0 1 0
0 0 1 -1 0 1
2^4=16
dim6/2-1,2-1;1,1b