Are there any skateboards?
No, there are no skateboards.
    src        edge_attr  dst
0     0  to the right of    7
1     0  to the right of   12
2     1  to the right of   15
3     1   to the left of   16
4     1  to the right of    6
5     2   to the left of   16
6     2  to the right of   17
7     6   to the left of    1
8     6   to the left of   15
9     7   to the left of    0
10    7               on    6
11    9   to the left of   13
12   12   to the left of    0
13   13  to the right of    9
14   13  to the right of   14
15   14   to the left of   13
16   15   to the left of    1
17   15  to the right of    6
18   16  to the right of    1
19   16  to the right of    2
20   16  to the right of   17
21   17   to the left of    2
22   17   to the left of   16