What kind of furniture is made of wood?
The furniture is a shelf.
    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]