Do you see a bus or a fence in this image?
Yes, there is a bus.
    src        edge_attr  dst
0     0  to the right of    4
1     0   to the left of   11
2     0   to the left of   13
3     1   to the left of   10
4     1  to the right of   19
5     1  to the right of   13
6     1  to the right of   18
7     4   to the left of   18
8     4   to the left of   13
9     4   to the left of    7
10    4   to the left of   19
11    4   to the left of    0
12    5  to the right of   13
13    7  to the right of    4
14    7   to the left of   11
15    7   to the left of   13
16    8             near   11
17    8          next to   11
18    8   to the left of   20
19    8   to the left of   11
20   10  to the right of    1
21   10  to the right of   20
22   10  to the right of   14
23   11      in front of   16
24   11             near    8
25   11  to the right of    7
26   11  to the right of    8
27   11  to the right of   15
28   11  to the right of   19
29   11  to the right of   18
30   11  to the right of   20
31   11  to the right of   13
32   11  to the right of    0
33   13  to the right of    4
34   13  to the right of   19
35   13   to the left of   11
36   13  to the right of    7
37   13   to the left of    5
38   13   to the left of    1
39   13  to the right of    0
40   13               in   14
41   14   to the left of   10
42   15   to the left of   11
43   16           behind   11
44   18   to the left of   11
45   18  to the right of    4
46   18   to the left of    1
47   19   to the left of   13
48   19   to the left of   11
49   19   to the left of    1
50   19  to the right of    4
51   20   to the left of   10
52   20  to the right of    8
53   20   to the left of   11
54   20               on   18