What device is to the left of the chairs that are not full?
The device is a microphone.
     src        edge_attr  dst
0      1   to the left of   22
1      1   to the left of    5
2      1   to the left of    8
3      1   to the left of   14
4      2          hung on   15
..   ...              ...  ...
132   25  to the right of    4
133   25  to the right of    5
134   25          wearing   23
135   25          wearing   24
136   25   to the left of    2

[137 rows x 3 columns]