What is the color of the tail?
The tail is red.
    src        edge_attr  dst
0     0  to the right of    3
1     3   to the left of    0
2     3  to the right of    7
3     5   to the left of   13
4     5   to the left of    7
5     6   to the left of   13
6     6  to the right of    9
7     6   to the left of   12
8     7  to the right of   12
9     7   to the left of    3
10    7  to the right of    5
11    8   to the left of   12
12    8   to the left of   13
13    9   to the left of   13
14    9   to the left of   12
15    9   to the left of    6
16   12  to the right of    6
17   12   to the left of    7
18   12   to the left of   13
19   12  to the right of    8
20   12  to the right of    9
21   13  to the right of   12
22   13  to the right of    9
23   13  to the right of    5
24   13  to the right of    8
25   13  to the right of    6