6
0/1 -2/1 -2/1      2/1 -2/1 -2/1       1/1 10/1 10/1
3/1 -2/1 -2/1      5/1 -2/1 -2/1       4/1 10/1 10/1
6/1 -2/1 -2/1      8/1 -2/1 -2/1       7/1 10/1 10/1
-2/1 0/1 1/1      -2/1 2/1 1/1       10/1 1/1 1/1
-2/1 3/1 4/1      -2/1 5/1 4/1       10/1 4/1 4/1
-2/1 6/1 7/1      -2/1 8/1 7/1       10/1 7/1 7/1