What devices are on the table?
The devices are laptops.
    src        edge_attr  dst
0     0               of    8
1     0  to the right of    3
2     1   to the left of    6
3     3   to the left of    8
4     3   to the left of    0
5     4   to the left of    5
6     5  to the right of    4
7     6  to the right of    1
8     8  to the right of    3
9     9  to the right of   10
10   10   to the left of   12
11   10   to the left of    9
12   11               on    2
13   12               on    2
14   12  to the right of   10