What is on the wall?
The graffiti is on the wall.
    src        edge_attr  dst
0     0   to the left of   14
1     0  to the right of    7
2     0   to the left of   13
3     2   to the left of    7
4     2               on    4
5     2  to the right of   11
6     2  to the right of    9
7     3   to the left of    4
8     4  to the right of    3
9     4  to the right of    6
10    4  to the right of   12
11    4  to the right of    7
12    6   to the left of    4
13    6  to the right of    7
14    7  to the right of   11
15    7  to the right of    2
16    7  to the right of    9
17    7   to the left of   14
18    7   to the left of    0
19    7   to the left of   13
20    7   to the left of    6
21    7   to the left of    8
22    7   to the left of    4
23    8  to the right of    7
24    9   to the left of    7
25    9   to the left of    2
26   10  to the right of   11
27   11   to the left of    2
28   11   to the left of   10
29   11   to the left of    7
30   12   to the left of    4
31   13  to the right of    7
32   13   to the left of   14
33   13  to the right of    0
34   14  to the right of    0
35   14  to the right of    7
36   14  to the right of   13