The cap has what color?
The cap is black.
    src        edge_attr  dst
0     1               in    2
1     1  to the right of    7
2     1  to the right of    6
3     6  to the right of    7
4     6   to the left of    1
5     7   to the left of    1
6     7   to the left of    6
7     7   to the left of    9
8     7             near    9
9     9   to the left of   10
10    9             near    7
11    9  to the right of    7
12   10  to the right of    9