What color is the fence made of wire?
The fence is black.
    src        edge_attr  dst
0     1  to the right of    8
1     1  to the right of    7
2     1  to the right of    4
3     3   to the left of    7
4     3   to the left of    6
5     4               of    2
6     4   to the left of    1
7     5  to the right of    7
8     6  to the right of    3
9     7   to the left of    1
10    7  to the right of    3
11    7   to the left of    5
12    8   to the left of    1