Is the bus to the left or to the right of the truck?
The bus is to the left of the truck.
    src        edge_attr  dst
0     0   to the left of    2
1     0   on the side of    6
2     0  to the right of    4
3     0   to the left of   12
4     1   to the left of   11
5     1           behind    6
6     2  to the right of    4
7     2  to the right of    0
8     2   to the left of   12
9     4   to the left of    2
10    4   to the left of    0
11    6   to the left of   11
12    6      in front of    1
13    7               of    1
14    8               of    6
15    9               of    6
16   11  to the right of    6
17   11  to the right of    1
18   11  to the right of   12
19   12  to the right of    0
20   12  to the right of    2
21   12   to the left of   11