What is on the tree?
The chain is on the tree.
    src        edge_attr  dst
0     0  to the right of   11
1     1  to the right of    6
2     1  to the right of   11
3     2  to the right of   11
4     3  to the right of   11
5     3  to the right of    5
6     4  to the right of   10
7     5               of   12
8     5  to the right of   11
9     5   to the left of    9
10    5   to the left of    3
11    6  to the right of   14
12    6   to the left of   17
13    6  to the right of   15
14    6   to the left of   12
15    6   to the left of    1
16    7  to the right of   11
17    8  to the right of   11
18    9  to the right of   11
19    9  to the right of    5
20   10  to the right of   11
21   10   to the left of    4
22   11   to the left of    8
23   11   to the left of    3
24   11   to the left of    0
25   11   to the left of    5
26   11   to the left of   13
27   11   to the left of   12
28   11   to the left of   10
29   11   to the left of    2
30   11   to the left of    1
31   11   to the left of    9
32   11   to the left of    7
33   11   to the left of   16
34   11   to the left of   17
35   12  to the right of    6
36   12  to the right of   15
37   12  to the right of   14
38   12  to the right of   11
39   13  to the right of   11
40   14   to the left of   12
41   14               on   11
42   14   to the left of    6
43   14   wrapped around   15
44   15   to the left of   12
45   15   to the left of    6
46   16  to the right of   11
47   16               of   12
48   17               on    1
49   17  to the right of    6
50   17  to the right of   11