Which kind of device is on top of the book?
The device is an ipod.
    src        edge_attr  dst
0     0               on   17
1     0  to the right of   20
2     0  to the right of   19
3     2        on top of   14
4     2  to the right of    6
..  ...              ...  ...
79   20   to the left of   21
80   20   to the left of   18
81   20   to the left of   19
82   21  to the right of   19
83   21  to the right of   20

[84 rows x 3 columns]