Does the tail look black?
No, the tail is red.
    src        edge_attr  dst
0     3               in   10
1     5  to the right of    6
2     5  to the right of    8
3     6   to the left of    5
4     6  to the right of    8
5     6  to the right of    9
6     6  to the right of    7
7     7   to the left of    6
8     7   to the left of    8
9     7  to the right of    9
10    8   to the left of    6
11    8   to the left of    5
12    8  to the right of    9
13    8  to the right of    7
14    9   to the left of    8
15    9   to the left of    7
16    9   to the left of    6