The number is on what?
The number is on the wall.
    src        edge_attr  dst
0     0   to the left of    4
1     1               on    6
2     2               by    7
3     2          next to    5
4     2            below    3
5     2   to the left of    5
6     2             near    5
7     4   to the left of    5
8     4  to the right of    0
9     5  to the right of    4
10    5  to the right of    2
11    5             near    2