Is this a bus or a train?
This is a train.
     src        edge_attr  dst
0      0  to the right of   12
1      0   to the left of   11
2      0   to the left of    1
3      0   to the left of    8
4      0   to the left of   16
..   ...              ...  ...
101   17  to the right of    5
102   17  to the right of    4
103   17  to the right of    1
104   17  to the right of   16
105   17  to the right of    8

[106 rows x 3 columns]