Which kind of furniture is black?
The furniture is shelves.
     src        edge_attr  dst
0      0  to the right of    1
1      0  to the right of    6
2      0  to the right of   11
3      0  to the right of   15
4      1          holding    9
..   ...              ...  ...
124   19   to the left of   20
125   20   to the left of   17
126   20  to the right of   19
127   20  to the right of   18
128   20  to the right of    8

[129 rows x 3 columns]