Is the bus to the left or to the right of the van?
The bus is to the left of the van.
    src        edge_attr  dst
0     0   to the left of    6
1     2   to the left of    9
2     3   to the left of   19
3     3   to the left of    7
4     4   to the left of    6
5     4  to the right of   10
6     5   to the left of   19
7     6  to the right of    4
8     6  to the right of    0
9     7  to the right of    3
10    9  to the right of    2
11   10   to the left of    4
12   12   to the left of   14
13   12   to the left of   16
14   12   to the left of   17
15   12  to the right of   15
16   12  to the right of   19
17   14   to the left of   16
18   14   to the left of   17
19   14  to the right of   18
20   14  to the right of   15
21   14  to the right of   12
22   15  to the right of   19
23   15   to the left of   14
24   15   to the left of   17
25   15   to the left of   18
26   15   to the left of   12
27   15   to the left of   16
28   16  to the right of   18
29   16  to the right of   15
30   16  to the right of   12
31   16  to the right of   14
32   17  to the right of   15
33   17  to the right of   18
34   17  to the right of   14
35   17  to the right of   12
36   18   to the left of   17
37   18   to the left of   16
38   18   to the left of   14
39   18  to the right of   15
40   18  to the right of   19
41   19  to the right of    5
42   19  to the right of    3
43   19   to the left of   12
44   19   to the left of   15
45   19   to the left of   18