Is the tray on the left of the picture?
No, the tray is on the right of the image.
    src        edge_attr  dst
0     1   to the left of    3
1     1   to the left of    9
2     1   to the left of    7
3     2               on    0
4     3   to the left of    7
5     3  to the right of    1
6     4               of    5
7     7               on    0
8     7  to the right of    3
9     7   to the left of    8
10    7   to the left of   10
11    7  to the right of    1
12    7  to the right of    9
13    8               on    0
14    8        on top of    2
15    8  to the right of    9
16    8  to the right of    7
17    9   to the left of    8
18    9   to the left of    7
19    9  to the right of    1
20    9   to the left of   10
21   10  to the right of    9
22   10  to the right of    7