Is the tail blue or black?
The tail is blue.
    src        edge_attr  dst
0     0               on   14
1     0   to the left of   10
2     0   to the left of    5
3     5  to the right of   11
4     5  to the right of    9
5     5  to the right of    0
6     7               on    6
7     8   to the left of   11
8     8  to the right of   13
9     9   to the left of    5
10    9   to the left of   10
11   10  to the right of    9
12   10  to the right of    0
13   11  to the right of   13
14   11  to the right of    8
15   11   to the left of    5
16   13   to the left of   11
17   13   to the left of    8