#2

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

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

dim5/4-3;1a

