6-2a

#g4 f1
6x6    % we missed out --1
-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 1 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
0 1 0 0 0 -1
0 1 0 0 0 0
1 1 0 0 0 -1
0 1 1 0 0 -1
0 0 0 1 0 -1
0 0 0 0 1 -1

6x6
0 1 0 0 -1 0
0 1 0 -1 0 0
-1 1 0 0 -1 0
0 1 -1 0 -1 0
0 0 0 0 -1 0
0 0 0 0 0 -1

6x6
2 0 -1 0 0 0
0 2 0 -1 0 0
-1 0 2 -1 0 0
0 -1 -1 2 -1 0
0 0 0 -1 2 -1
0 0 0 0 -1 2

2^8 * 3^4 * 5 = 103680
dim6/6-2b