On which side is the bus?
The bus is on the left of the image.
    src        edge_attr  dst
0     0   to the left of    1
1     1  to the right of    0
2     1  to the right of    3
3     1  to the right of    2
4     1  to the right of    7
5     1  to the right of   10
6     2   to the left of    1
7     3  to the right of    5
8     3   to the left of    1
9     3   to the left of   10
10    5   to the left of    3
11    6   to the left of    8
12    7   to the left of    1
13    7   to the left of   10
14    8  to the right of    6
15    9               of    1
16   10  to the right of    7
17   10  to the right of    3
18   10   to the left of    1