On which side is the shelf?
The shelf is on the left of the image.
    src        edge_attr  dst
0     0   to the left of   17
1     0   to the left of    1
2     0   to the left of   18
3     1   to the left of    2
4     1  to the right of    7
5     1  to the right of   25
6     1   to the left of   14
7     1  to the right of    0
8     1  to the right of   16
9     2  to the right of    1
10    2  to the right of   17
11    2  to the right of   18
12    7   to the left of   25
13    7   to the left of    1
14    8  to the right of   12
15    8  to the right of   10
16    8  to the right of   14
17   10   to the left of    8
18   11   to the left of   21
19   12   to the left of    8
20   14   to the left of    8
21   14  to the right of    1
22   16   to the left of    1
23   17   to the left of    2
24   17  to the right of    0
25   17               on   18
26   18  to the right of    0
27   18   to the left of    2
28   19  to the right of   21
29   20  to the right of   29
30   20   to the left of   27
31   20   to the left of   21
32   21  to the right of   11
33   21   to the left of   19
34   21  to the right of   20
35   21  to the right of   27
36   22               on   26
37   23               on   26
38   25   to the left of    1
39   25  to the right of    7
40   27  to the right of   20
41   27   to the left of   28
42   27   to the left of   21
43   27  to the right of   29
44   28  to the right of   27
45   29   to the left of   20
46   29   to the left of   27