Is there a dark lamp in the scene?
No, there is a lamp but it is light.
    src        edge_attr  dst
0     0   to the left of   12
1     0   to the left of    3
2     1  to the right of   25
3     2   to the left of    4
4     3  to the right of    0
5     4  to the right of    2
6     4   to the left of   20
7     4   to the left of   12
8     5   to the left of   10
9     5   to the left of   22
10    6  to the right of   15
11    8  to the right of   24
12    8   to the left of   26
13    9   to the left of   17
14   10  to the right of   11
15   10  to the right of    5
16   11   to the left of   22
17   11   to the left of   10
18   12  to the right of   20
19   12  to the right of    4
20   12  to the right of    0
21   13   to the left of   14
22   14               on   13
23   14  to the right of   13
24   15   to the left of    6
25   16  to the right of   21
26   17  to the right of    9
27   17  to the right of   26
28   18               of   19
29   19  to the right of   23
30   20  to the right of    4
31   20   to the left of   12
32   21   to the left of   16
33   22  to the right of   11
34   22  to the right of    5
35   23   to the left of   19
36   24   to the left of    8
37   24   to the left of   26
38   25   to the left of    1
39   26  to the right of   24
40   26  to the right of    8
41   26   to the left of   17