What is the dog on?
The dog is on the surf board.
    src        edge_attr  dst
0     0      flying over    8
1     1          pushing    5
2     1               on    6
3     1               in    8
4     1   to the left of    6
5     1   to the left of    5
6     1             with    5
7     2   to the left of    4
8     2   to the left of    3
9     3  to the right of    2
10    4  to the right of    2
11    5   to the left of    6
12    5               in    8
13    5  to the right of    1
14    5        pushed by    1
15    5               on    6
16    6  to the right of    1
17    6               in    8
18    6  to the right of    5
19    9         lying on    3
20    9               in    8
21    9               on    3
22    9          wearing    4