What is the color of the cow to the left of the bull?
The cow is black.
    src        edge_attr  dst
0     2  to the right of    7
1     2  to the right of    4
2     3   to the left of    4
3     4   to the left of    2
4     4  to the right of    3
5     4   to the left of    7
6     5  to the right of   14
7     6  to the right of    8
8     7   to the left of   12
9     7   to the left of   10
10    7  to the right of    4
11    7   to the left of    2
12    8   to the left of    6
13   10  to the right of    7
14   12  to the right of    7
15   14   to the left of    5