What is on the shelf?
The paper is on the shelf.
    src        edge_attr  dst
0     1   to the left of    9
1     2  to the right of    6
2     2  to the right of    7
3     3               on    4
4     3  to the right of    7
5     3  to the right of    6
6     4  to the right of    6
7     4  to the right of    7
8     4            above    9
9     6   to the left of    4
10    6   to the left of    3
11    6   to the left of    8
12    6           beside    9
13    6   to the left of    2
14    7   to the left of   11
15    7   to the left of    8
16    7   to the left of    3
17    7   to the left of    2
18    7   to the left of    4
19    8  to the right of    6
20    8  to the right of    7
21    9               in   10
22    9  to the right of    1
23    9            below    4
24   11  to the right of    7