#2

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

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

dim6/4-2;2-1a

