What color is the door?
The door is gray.
     src        edge_attr  dst
0      0  to the right of   13
1      0  to the right of    9
2      0  to the right of   21
3      2  to the right of    9
4      2   to the left of   18
..   ...              ...  ...
96    20   to the left of    6
97    21   to the left of    2
98    21   to the left of    0
99    21  to the right of   11
100   21  to the right of   14

[101 rows x 3 columns]