What is on the wall?
The tiles are on the wall.
    src        edge_attr  dst
0     0               on    5
1     0   to the left of    5
2     0  to the right of    4
3     1               in    3
4     2   to the left of    5
5     2  to the right of    4
6     4   to the left of    2
7     4               in    3
8     4   to the left of    5
9     4   to the left of    0
10    5  to the right of    0
11    5  to the right of    4
12    5  to the right of    2