Does the tie look black?
No, the tie is red.
    src        edge_attr  dst
0     0   to the left of   15
1     0   to the left of    8
2     0   to the left of    7
3     0   to the left of    5
4     1   to the left of   15
5     3   to the left of   15
6     3   to the left of   16
7     3  to the right of   12
8     4   to the left of    7
9     4   to the left of   15
10    5  to the right of    0
11    5  to the right of    9
12    6   to the left of   15
13    6   to the left of   16
14    7  to the right of    4
15    7  to the right of    9
16    7  to the right of    0
17    7  to the right of   10
18    8  to the right of    0
19    8  to the right of    9
20    9   to the left of   15
21    9   to the left of    7
22    9   to the left of    8
23    9               of    0
24    9   to the left of    5
25   10   to the left of    7
26   10   to the left of   15
27   11               of    0
28   11  to the right of   13
29   11   to the left of   15
30   12   to the left of    3
31   13   to the left of   15
32   13  to the right of   14
33   13   to the left of   11
34   14               of    0
35   14   to the left of   13
36   15  to the right of    6
37   15  to the right of   10
38   15  to the right of    3
39   15  to the right of    4
40   15  to the right of    0
41   15  to the right of    1
42   15  to the right of    9
43   15  to the right of   11
44   15  to the right of   13
45   16  to the right of    6
46   16  to the right of    3