What is on the beach?
The truck is on the beach.
    src        edge_attr  dst
0     0  to the right of    1
1     1   to the left of    0
2     2               of   12
3     2  to the right of    4
4     2  to the right of    3
5     3   to the left of    2
6     3   to the left of    5
7     4   to the left of    2
8     4   to the left of    5
9     5  to the right of    4
10    5  to the right of    3
11    8  to the right of   11
12    8  to the right of    9
13    8  to the right of   10
14    9   to the left of    8
15    9   to the left of   11
16    9   to the left of   10
17   10   to the left of    8
18   10   to the left of   11
19   10  to the right of    9
20   11  to the right of   10
21   11  to the right of    9
22   11   to the left of    8
23   12               on   13