What is on the shelf?
The tissue box is on the shelf.
    src        edge_attr  dst
0     1  to the right of   14
1     2   to the left of   11
2     3   to the left of   16
3     3  to the right of   14
4     4   to the left of    9
5     4   to the left of   12
6     4   to the left of    8
7     5  to the right of   14
8     7           behind   17
9     8  to the right of    4
10    9  to the right of    4
11   10  to the right of   14
12   11               on   10
13   11  to the right of   14
14   11  to the right of    2
15   12  to the right of    4
16   13   to the left of   18
17   14   to the left of    1
18   14   to the left of    3
19   14   to the left of   10
20   14   to the left of   11
21   14   to the left of    5
22   15   to the left of   17
23   16  to the right of    3
24   16   to the left of   18
25   17      in front of    7
26   17  to the right of   15
27   18  to the right of   16
28   18  to the right of   13