What color does the cap have?
The cap has blue color.
    src        edge_attr  dst
0     0  to the right of   12
1     0  to the right of    3
2     1               of    0
3     1  to the right of   12
4     1  to the right of    3
5     2   to the left of   11
6     2   to the left of    3
7     3  to the right of    2
8     3   to the left of    1
9     3   to the left of    0
10   11  to the right of    2
11   12   to the left of    1
12   12   to the left of    0