What are the boys on?
The boys are on the scooter.
    src        edge_attr  dst
0     1   to the left of    7
1     1   to the left of   14
2     1   to the left of   13
3     1   to the left of    3
4     1   to the left of   15
5     1   to the left of   20
6     2   to the left of   13
7     2   to the left of   20
8     3  to the right of   19
9     3  to the right of    1
10    4   to the left of   11
11    4               on   12
12    5  to the right of   13
13    6  to the right of   15
14    6  to the right of    8
15    7  to the right of    1
16    7  to the right of   13
17    8   to the left of   11
18    8               on   12
19    8   to the left of    6
20    8   to the left of   10
21    9  to the right of   13
22    9  on the front of   11
23    9   to the left of   10
24   10  to the right of   12
25   10  to the right of    9
26   10  to the right of    8
27   11               on   18
28   11  to the right of    4
29   11  to the right of    8
30   11  to the right of   15
31   11  to the right of   13
32   12               on   18
33   12   to the left of   10
34   13  to the right of    2
35   13  to the right of    1
36   13   to the left of    9
37   13   to the left of    5
38   13   to the left of   15
39   13   to the left of    7
40   13   to the left of   11
41   14  to the right of    1
42   14  to the right of   19
43   15  to the right of   13
44   15        parked on   18
45   15  to the right of    1
46   15   to the left of   11
47   15   to the left of    6
48   19   to the left of   14
49   19   to the left of    3
50   20  to the right of    1
51   20  to the right of    2