Is the toilet to the left or to the right of the dispenser in the middle?
The toilet is to the right of the dispenser.
   src        edge_attr  dst
0    0   to the left of    4
1    1  to the right of    9
2    4  to the right of    0
3    7   to the left of   12
4    9   to the left of    1
5    9   to the left of   11
6   11  to the right of    9
7   12  to the right of    7