What color is the bird on the branch?
The bird is gray.
    src        edge_attr  dst
0     0  to the right of    2
1     1  to the right of    2
2     2   to the left of    0
3     2   to the left of    5
4     2   to the left of    1
5     3               on    4
6     3   to the left of    5
7     5  to the right of    8
8     5  to the right of    7
9     5  to the right of    3
10    5  to the right of    2
11    7   to the left of    5
12    8   to the left of    5