Is there a bear that is not brown?
No, there is a bear but it is brown.
    src        edge_attr  dst
0     0  to the right of   12
1     0  to the right of   11
2     0  to the right of    1
3     0   to the left of   18
4     0   to the left of    3
..  ...              ...  ...
66   17   to the left of   16
67   17  to the right of    7
68   17   to the left of    8
69   18  to the right of    0
70   18  to the right of    9

[71 rows x 3 columns]