What is on the fence?
The graffiti is on the fence.
    src        edge_attr  dst
0     0  to the right of    4
1     0               on    2
2     1      in front of    2
3     1          next to    2
4     1             near    2
5     2           behind    1
6     2             near    1
7     2           behind    6
8     2             near   10
9     3   to the left of    7
10    4   to the left of    0
11    6      in front of    2
12    7  to the right of    3
13    9               on   10
14   10             near    2