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