On which side of the image is the tray?
The tray is on the left of the image.
    src        edge_attr  dst
0     0  to the right of    8
1     0  to the right of   16
2     0   to the left of    9
3     1  to the right of   12
4     2  to the right of   12
5     3   to the left of   14
6     3   to the left of    9
7     6   to the left of   12
8     8   to the left of    0
9     8   to the left of    9
10    9  to the right of   16
11    9  to the right of    0
12    9  to the right of    3
13    9  to the right of    8
14    9  to the right of   12
15   11  to the right of   17
16   12   to the left of   14
17   12   to the left of    1
18   12   to the left of    9
19   12  to the right of    6
20   12               on   10
21   12   to the left of    2
22   13  to the right of   17
23   14  to the right of    3
24   14  to the right of   12
25   16   to the left of    0
26   16   to the left of    9
27   17   to the left of   13
28   17   to the left of   11