What does the brown dog walk on?
The dog walks on the ground.
    src        edge_attr  dst
0     0   to the left of   16
1     0  to the right of    6
2     1      standing in    8
3     1          wearing    5
4     1          holding    0
5     1  to the right of   15
6     1  to the right of   14
7     1   to the left of    7
8     1  to the right of    6
9     1   to the left of   10
10    1   to the left of   16
11    2  to the right of    6
12    2   to the left of   16
13    2   to the left of    7
14    2  to the right of   15
15    2   to the left of   10
16    3               in    9
17    5  to the right of   14
18    5   to the left of   16
19    5  to the right of    6
20    6      standing in    8
21    6          holding   14
22    6         watching   11
23    6      standing on    8
24    6   to the left of    0
25    6   to the left of    2
26    6         watching   13
27    6  to the right of   13
28    6   to the left of    1
29    6   to the left of    5
30    7  to the right of    1
31    7  to the right of    2
32   10  to the right of    2
33   10  to the right of    1
34   11       walking on    8
35   11       looking at   16
36   11          wearing   12
37   11   to the left of   13
38   12   to the left of   13
39   13  to the right of   12
40   13  to the right of   11
41   13   to the left of    6
42   14   to the left of    1
43   14   to the left of    5
44   15   to the left of    1
45   15   to the left of    2
46   16  to the right of    0
47   16  to the right of    2
48   16          wearing   15
49   16          holding   10
50   16  to the right of    5
51   16          tossing   10
52   16  to the right of    1
53   16          wearing    4