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This is a balloon.
     src        edge_attr  dst
0      0   to the left of   51
1      0  to the right of   38
2      0   to the left of   40
3      0   to the left of   68
4      0  to the right of   69
..   ...              ...  ...
419   72   to the left of   58
420   72   to the left of   59
421   72   to the left of    7
422   72   to the left of    6
423   72   to the left of   55

[424 rows x 3 columns]