The ladder is on what?
The ladder is on the fire truck.
    src        edge_attr  dst
0     0  to the right of    7
1     3   to the left of    9
2     3   to the left of    8
3     3  to the right of    5
4     3   to the left of    7
5     3  to the right of    6
6     5   to the left of    3
7     6   to the left of    3
8     6          wearing    5
9     6   to the left of    8
10    7  to the right of    9
11    7  to the right of    3
12    7   to the left of    0
13    8               on    9
14    8  to the right of    6
15    8  to the right of    3
16    9   to the left of    7
17    9  to the right of    3