Which kind of furniture is made of wood?
The furniture is a bookshelf.
    src        edge_attr  dst
0     0  to the right of    3
1     0  to the right of   15
2     0  to the right of   20
3     1   to the left of    5
4     2  to the right of    3
..  ...              ...  ...
74   20   to the left of    6
75   20   to the left of    7
76   20   to the left of    2
77   20   to the left of    0
78   20   to the left of    4

[79 rows x 3 columns]