How long is the bridge?
The bridge is long.
     src        edge_attr  dst
0      0   to the left of   18
1      0   to the left of   25
2      0   to the left of   32
3      0   to the left of   29
4      0   to the left of   28
..   ...              ...  ...
223   32  to the right of   25
224   32  to the right of    5
225   32  to the right of   13
226   32  to the right of    3
227   32  to the right of    4

[228 rows x 3 columns]