Which kind of device is to the left of the bookcase?
The device is a monitor.
    src        edge_attr  dst
0     0  to the right of   21
1     0  to the right of   20
2     0  to the right of    2
3     0  to the right of   15
4     0  to the right of    4
..  ...              ...  ...
75   21   to the left of    0
76   21  to the right of    1
77   21          wearing   15
78   21   to the left of    5
79   21   to the left of    9

[80 rows x 3 columns]