#2
7
0 1 0 0 0 0 1
1 0 0 0 0 0 -1
0 0 0 1 0 0 0
0 0 1 0 0 0 0
0 0 0 0 1 0 0
0 0 0 0 0 1 0
0 0 0 0 0 0 1
7
0 0 1 0 0 0 0
0 0 0 1 0 0 0
0 0 0 0 1 0 0
0 0 0 0 0 1 0
1 0 0 0 0 0 0
0 1 0 0 0 0 0
0 0 0 0 0 0 1
