Are there both a zebra and an antelope?
Yes, there are both an antelope and a zebra.
    src        edge_attr  dst
0     0  to the right of    6
1     0  to the right of    4
2     1   to the left of    6
3     1   to the left of    2
4     2  to the right of    1
5     2   to the left of    6
6     3   to the left of   15
7     3   to the left of   12
8     3   to the left of   10
9     3      in front of    6
10    4   to the left of    0
11    5  to the right of    6
12    5  to the right of   11
13    6   to the left of   14
14    6           behind    3
15    6  to the right of    1
16    6  to the right of    2
17    6   to the left of    5
18    6  to the right of   10
19    6   to the left of    0
20    6               in   13
21    7   to the left of   14
22    7  to the right of   10
23    8  to the right of   10
24    9  to the right of   12
25   10   to the left of    8
26   10  to the right of   12
27   10   to the left of    6
28   10      in front of   11
29   10  to the right of    3
30   10   to the left of    7
31   11   to the left of   14
32   11           behind   10
33   11   to the left of    5
34   12  to the right of    3
35   12   to the left of    9
36   12   to the left of   15
37   12   to the left of   10
38   14  to the right of    7
39   14  to the right of    6
40   14  to the right of   11
41   15  to the right of    3
42   15  to the right of   12