Which animal is this, a horse or a pig?
This is a horse.
    src        edge_attr  dst
0     0        pulled by    1
1     0  to the right of    1
2     1          pulling    2
3     1          pulling    0
4     1   to the left of    9
5     1   to the left of    0
6     1   to the left of    7
7     1  to the right of    3
8     2        pulled by    1
9     3   to the left of    1
10    3   to the left of    6
11    4   on the side of    8
12    4   to the left of    6
13    5  to the right of    6
14    6   to the left of    5
15    6  to the right of    4
16    6  to the right of    3
17    6   to the left of    7
18    6   to the left of    9
19    7  to the right of    1
20    7  to the right of    6
21    9          wearing    7
22    9  to the right of    1
23    9  to the right of    6