amb_space 16
equations 9
1 1 1 1 -1 -1 -1 -1  0  0  0  0  0  0  0  0
1 1 1 1  0  0  0  0 -1 -1 -1 -1  0  0  0  0
1 1 1 1  0  0  0  0  0  0  0  0 -1 -1 -1 -1
0 1 1 1 -1  0  0  0 -1  0  0  0 -1  0  0  0
1 0 1 1  0 -1  0  0  0 -1  0  0  0 -1  0  0
1 1 0 1  0  0 -1  0  0  0 -1  0  0  0 -1  0
1 1 1 0  0  0  0 -1  0  0  0 -1  0  0  0 -1
0 1 1 1  0 -1  0  0  0  0 -1  0  0  0  0 -1
1 1 1 0  0  0 -1  0  0 -1  0  0 -1  0  0  0