Which color do you think the cap is?
The cap is white.
    src        edge_attr  dst
0     0   to the left of   15
1     0   to the left of   21
2     0   to the left of   16
3     1  to the right of   15
4     2  to the right of   10
..  ...              ...  ...
63   21  to the right of   11
64   21  to the right of   12
65   21  to the right of    0
66   22  to the right of    7
67   22  to the right of   10

[68 rows x 3 columns]