In which part is the glass shelf?
The shelf is on the right of the image.
    src        edge_attr  dst
0     0               on    1
1     0   to the left of    7
2     0   to the left of   18
3     1  to the right of   11
4     3  to the right of    9
5     3  to the right of   13
6     3  to the right of   12
7     3               on   18
8     4  to the right of    5
9     4  to the right of   17
10    5   to the left of   17
11    5   to the left of    4
12    5   to the left of   11
13    5   to the left of    9
14    7  to the right of    0
15    7               on    1
16    8               on    5
17    8   to the left of    9
18    8   to the left of   17
19    9   to the left of    3
20    9  to the right of    5
21    9   to the left of   18
22    9  to the right of    8
23    9               of   19
24   10               on   15
25   11  to the right of   14
26   11   to the left of    1
27   11  to the right of    5
28   12   to the left of   18
29   12   to the left of    3
30   13   to the left of   18
31   13   to the left of    3
32   14   to the left of   11
33   16        on top of    1
34   17  to the right of    5
35   17   to the left of    4
36   17  to the right of    8
37   18  to the right of    9
38   18  to the right of    0
39   18  to the right of   12
40   18  to the right of   13