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