What do you think is located on top of the post?
The lamp is on top of the post.
    src        edge_attr  dst
0     0  to the right of   16
1     0  to the right of   17
2     0  to the right of   15
3     2   to the left of   16
4     2   to the left of    5
5     2   to the left of   15
6     2   to the left of   18
7     3   to the left of   13
8     3   to the left of   11
9     4   to the left of   11
10    4   to the left of   13
11    5  to the right of   15
12    5  to the right of   16
13    5  to the right of    2
14    5   to the left of    6
15    5   to the left of   11
16    6  to the right of   15
17    6  to the right of   16
18    6  to the right of    5
19    6  to the right of   18
20   10  to the right of   16
21   10  to the right of   17
22   10  to the right of   15
23   11  to the right of    4
24   11  to the right of    5
25   11  to the right of    3
26   11  to the right of   18
27   13  to the right of    3
28   13  to the right of    4
29   14  to the right of   15
30   14  to the right of   16
31   15   to the left of   14
32   15   to the left of    6
33   15  to the right of   16
34   15  to the right of    2
35   15   to the left of   10
36   15   to the left of    5
37   15   to the left of    0
38   16   to the left of    0
39   16   to the left of   15
40   16   to the left of   17
41   16   to the left of   10
42   16   to the left of    5
43   16   to the left of    6
44   16  to the right of    2
45   16   to the left of   14
46   17        on top of   15
47   17   to the left of    0
48   17  to the right of   16
49   17   to the left of   10
50   18   to the left of   11
51   18  to the right of    2
52   18   to the left of    6