What was used to make the pipe, concrete or chrome?
The pipe is made of chrome.
    src        edge_attr  dst
0     0   to the left of    4
1     0   to the left of   18
2     0   to the left of   12
3     1   to the left of   18
4     1   to the left of   10
..  ...              ...  ...
65   18  to the right of    3
66   18  to the right of    5
67   18  to the right of   17
68   18  to the right of   11
69   18  to the right of    1

[70 rows x 3 columns]