What animal is in front of the wall?
The bear is in front of the wall.
   src        edge_attr  dst
0    1      in front of    8
1    3               of    1
2    4   to the left of    7
3    4   to the left of    5
4    5  to the right of    7
5    5  to the right of    4
6    7   to the left of    5
7    7  to the right of    4
8    8           behind    1