What is the chain going through?
The chain is going through the post.
     src        edge_attr  dst
0      0  to the right of   17
1      0  to the right of   13
2      0   to the left of   21
3      1  to the right of   15
4      1  to the right of   13
..   ...              ...  ...
127   26  to the right of   12
128   26  to the right of   11
129   26  to the right of   14
130   26  to the right of   13
131   26        on top of   16

[132 rows x 3 columns]