On which side are the flags?
The flags are on the left of the image.
    src        edge_attr  dst
0     1   to the left of   14
1     1  to the right of   22
2     1   to the left of   15
3     2  to the right of   17
4     2  to the right of    3
..  ...              ...  ...
93   23  to the right of    4
94   23               on   21
95   23  to the right of   19
96   23   to the left of   15
97   23               in   21

[98 rows x 3 columns]