What is the shelf that is to the left of the chair made of?
The shelf is made of wood.
    src        edge_attr  dst
0     0  to the right of    9
1     0  to the right of    3
2     0  to the right of    2
3     0   to the left of   16
4     1  to the right of   19
..  ...              ...  ...
84   19   to the left of   10
85   19   to the left of   12
86   20  to the right of   14
87   20   to the left of   15
88   20  to the right of   19

[89 rows x 3 columns]