Who wears the boot?
The jockey wears a boot.
    src        edge_attr  dst
0     0   to the left of    7
1     1   to the left of    8
2     1   to the left of    9
3     1   to the left of    2
4     1   to the left of    7
5     1   to the left of    3
6     2  to the right of    5
7     2  to the right of    1
8     3  to the right of    1
9     3   to the left of    4
10    4  to the right of    9
11    4  to the right of    3
12    5   to the left of    2
13    5   to the left of    9
14    6   to the left of    7
15    7  to the right of    0
16    7  to the right of    1
17    7  to the right of    6
18    7            above   10
19    8  to the right of    1
20    9  to the right of    1
21    9       sitting on    7
22    9          wearing    8
23    9  to the right of    5
24    9   to the left of    4