12

0 0 6 1 -5 1
10 11 12 3 2 1
10 11 12 0 5 1
-6 -7 6 -10 -9 2
-10 -9 2 -6 -7 6
1 -1 2 0 3 6
1 -5 1 0 0 6
3 2 1 10 11 12
-35 -87 11 -44 -85 2
0 3 6 1 -1 2
0 5 1 10 11 12
-44 -85 2 -35 -87 11