Are there zebras behind the rock?
No, there is a horse behind the rock.
    src        edge_attr  dst
0     0  to the right of   16
1     1           behind    3
2     1         lying on   14
3     1               in    5
4     1  to the right of   16
5     1  to the right of    8
6     1       sitting on    8
7     2  to the right of   16
8     3      in front of    1
9     3   to the left of    5
10    4  to the right of    8
11    5  to the right of    3
12    5  to the right of    8
13    6   to the left of   12
14    6   to the left of    7
15    7  to the right of    6
16    7  to the right of    9
17    8   to the left of    1
18    8   to the left of    5
19    8   to the left of    4
20    9   to the left of    7
21    9   to the left of   15
22   12  to the right of    6
23   15  to the right of   16
24   15  to the right of    9
25   16   to the left of    2
26   16   to the left of    1
27   16   to the left of   15
28   16   to the left of    0