Is the horse to the left or to the right of the dog?
The horse is to the right of the dog.
    src        edge_attr  dst
0     0   to the left of    7
1     0   to the left of    5
2     0   to the left of   20
3     1   to the left of   16
4     2   to the left of    3
5     3  to the right of    2
6     4  to the right of    7
7     4  to the right of    5
8     5   to the left of    4
9     5  to the right of    0
10    6   to the left of    8
11    7          wearing    5
12    7           riding   20
13    7   to the left of    4
14    7               on   20
15    7   to the left of    9
16    7          wearing   16
17    7  to the right of    0
18    8   to the left of   20
19    8   to the left of   11
20    8  to the right of    6
21    9  to the right of   18
22    9  to the right of   10
23    9  to the right of    7
24   10  to the right of   11
25   10   to the left of   17
26   10   to the left of    9
27   10   to the left of   18
28   11   to the left of   10
29   11   to the left of   18
30   11  to the right of   15
31   11  to the right of    8
32   15       walking by   20
33   15   to the left of   11
34   15   to the left of   20
35   16  to the right of    1
36   17  to the right of   18
37   17  to the right of   10
38   18  to the right of   10
39   18   to the left of    9
40   18   to the left of   17
41   18  to the right of   11
42   20  to the right of    8
43   20  to the right of    0
44   20  to the right of   15