What is on the brick wall?
The clock is on the wall.
   src        edge_attr  dst
0    0   to the left of    6
1    2   to the left of    6
2    2  to the right of    7
3    2               on    3
4    4  to the right of    7
5    5        on top of    2
6    6  to the right of    0
7    6  to the right of    2
8    7   to the left of    2
9    7   to the left of    4