Is this a cow or a horse?
This is a cow.
    src        edge_attr  dst
0     0   to the left of    8
1     0  to the right of    1
2     0  to the right of    6
3     0   to the left of    4
4     1   to the left of    0
5     1   to the left of    3
6     2   to the left of    3
7     3  to the right of    1
8     3  to the right of    6
9     3  to the right of    2
10    4   to the left of    8
11    4               of    3
12    4  to the right of    0
13    5               of    3
14    6   to the left of    0
15    6   to the left of    3
16    6               in    1
17    8  to the right of    0
18    8  to the right of    4