What is on the wall?
The graffiti is on the wall.
   src        edge_attr  dst
0    0  to the right of    3
1    1  to the right of    3
2    2  to the right of    3
3    3               on    4
4    3   to the left of    2
5    3   to the left of    1
6    3   to the left of    0
7    5          holding    2