# This example was contributed by Rachid Seghir <rachid.seghir@gmail.com>
9  9
0  1 -7  0 -2 -1  0  0  2
1  0  1  0  0  0  0  0 -1
1  0 -1  0  0  0  1  0  0
1  0  0  1  0  0  0  0 -1
1  0  0 -1  0  0  0  3  2
1  0  0  0  1  0  0  0 -1
1  0  0  2 -1  0  1  0  0
1  0  0  0  0  1  0  0 -1
1  0  3  1  0 -1  0  0 -1

E 4
P 2

N  M
