What's the pipe on?
The pipe is on the roof.
    src        edge_attr  dst
0     0  to the right of   21
1     0  to the right of   14
2     0  to the right of   15
3     0  to the right of    4
4     0  to the right of    2
..  ...              ...  ...
56   21   to the left of   16
57   22   to the left of   11
58   22   to the left of    0
59   23  to the right of   13
60   23   to the left of    0

[61 rows x 3 columns]