What sign is hanging on the wall?
The sign is a street sign.
    src        edge_attr  dst
0     1   to the left of   14
1     1   to the left of    3
2     1   to the left of    6
3     1   to the left of   12
4     1   to the left of   17
5     3  to the right of    1
6     3  to the right of   10
7     3   to the left of   17
8     3   to the left of   18
9     6   to the left of   18
10    6  to the right of    1
11    8   decorated with    9
12   10   to the left of   14
13   10   to the left of    3
14   12  to the right of    1
15   14  to the right of    1
16   14  to the right of   10
17   14   to the left of   18
18   14       hanging on    4
19   17       hanging on    4
20   17  to the right of    1
21   17   to the left of   18
22   17             near   18
23   17  to the right of    3
24   18  to the right of   17
25   18  to the right of   14
26   18             near   17
27   18  to the right of    3
28   18  to the right of    6