What is the color of the cap?
The cap is white.
   src        edge_attr  dst
0    1  to the right of    5
1    3   to the left of    9
2    4  to the right of   10
3    5   to the left of    1
4    5   to the left of    9
5    6  to the right of   10
6    9  to the right of    5
7    9  to the right of    3
8   10   to the left of    6
9   10   to the left of    4