What is the color of the wood ladder?
The ladder is black.
    src        edge_attr  dst
0     0   to the left of   12
1     0   to the left of   14
2     0   to the left of    7
3     0   to the left of    2
4     2  to the right of    0
5     3   to the left of   13
6     4   to the left of   12
7     5            below    9
8     6  to the right of   10
9     7  to the right of    0
10    9               on    5
11    9       sitting on    5
12   10   to the left of   12
13   10   to the left of   14
14   10   to the left of    6
15   10           beside    4
16   12  to the right of   10
17   12  to the right of    4
18   12  to the right of    0
19   13  to the right of    3
20   14  to the right of   10
21   14  to the right of    0