Does the cap have black color?
Yes, the cap is black.
     src        edge_attr  dst
0      0  to the right of    9
1      0  to the right of   21
2      0   to the left of   16
3      1  to the right of    8
4      1  to the right of   19
..   ...              ...  ...
110   24   to the left of   17
111   24   to the left of   19
112   24   to the left of   14
113   24  to the right of   13
114   24   to the left of    8

[115 rows x 3 columns]