How long is the gray tail?
The tail is long.
     src        edge_attr  dst
0      1   to the left of   17
1      1   to the left of    5
2      1  to the right of    9
3      1   to the left of    7
4      1   to the left of   15
..   ...              ...  ...
96    17   to the left of   11
97    17  to the right of    1
98    17  to the right of    6
99    17  to the right of   16
100   17  to the right of    7

[101 rows x 3 columns]