Of which color is the tail?
The tail is black.
    src        edge_attr  dst
0     0   to the left of    5
1     0   to the left of    3
2     0   to the left of   11
3     0   to the left of    6
4     0   to the left of    4
5     0   to the left of   12
6     3  to the right of    0
7     3  to the right of    4
8     3   to the left of   10
9     4   to the left of    3
10    4  to the right of    0
11    4   to the left of   10
12    5  to the right of    0
13    5   to the left of   10
14    5  to the right of    7
15    6               in    1
16    6  to the right of    0
17    7   to the left of   11
18    7             near   11
19    7   to the left of    5
20    8   to the left of   13
21    8               on    9
22   10      surrounding   11
23   10             near   11
24   10               on    9
25   10  to the right of    4
26   10  to the right of    3
27   10  to the right of    5
28   10  to the right of   13
29   10  to the right of   11
30   10  to the right of   12
31   11  to the right of    0
32   11  to the right of    7
33   11               on    7
34   11             near    7
35   11    surrounded by   10
36   11   to the left of   10
37   11             near   10
38   11               in   10
39   12   to the left of   10
40   12  to the right of    0
41   13  to the right of    8
42   13   to the left of   10
43   13  to the right of   14
44   14   to the left of   13