Are there either lamps or tables?
Yes, there is a lamp.
   src        edge_attr  dst
0    0               by    3
1    0  to the right of    3
2    0  to the right of    4
3    2  to the right of    3
4    3   to the left of    0
5    3   to the left of    2
6    4   to the left of    0
7    7   to the left of    8
8    8  to the right of    7