The ground has what color?
The ground is dark.
    src        edge_attr  dst
0     0  to the right of    2
1     0   walking behind    4
2     1   to the left of    2
3     2  to the right of    1
4     2   to the left of    0
5     3               of    4
6     4          wearing    3
7     5  to the right of    7
8     5  to the right of    8
9     6  to the right of    8
10    6  to the right of    7
11    7   to the left of    5
12    7   to the left of    6
13    8   to the left of    6
14    8   to the left of    5