Are these cows or zebras?
These are cows.
    src        edge_attr  dst
0     0   to the left of    1
1     0   to the left of   13
2     0   to the left of   10
3     0   to the left of   14
4     1   to the left of   11
5     1   to the left of   10
6     1  to the right of    0
7     2   to the left of   10
8     2   to the left of   11
9     2   to the left of   16
10    3   to the left of   10
11    3   to the left of   12
12    3   to the left of   16
13    3   to the left of    9
14    3   to the left of   11
15    4   to the left of   11
16    4   to the left of   16
17    4   to the left of   10
18    4             near   16
19    4             near   14
20    7   to the left of   14
21    7   to the left of   10
22    7   to the left of   17
23    8   to the left of   15
24    9  to the right of    3
25    9   to the left of   16
26    9   to the left of   11
27    9   to the left of   10
28   10  to the right of    4
29   10  to the right of    7
30   10  to the right of    0
31   10  to the right of   14
32   10  to the right of    9
33   10  to the right of    3
34   10  to the right of    2
35   10  to the right of    1
36   10  to the right of   15
37   11  to the right of    3
38   11  to the right of    4
39   11  to the right of    2
40   11  to the right of    9
41   11  to the right of    1
42   12  to the right of    3
43   12   to the left of   16
44   13  to the right of    0
45   14          next to    4
46   14  to the right of    7
47   14   to the left of   10
48   14  to the right of    0
49   15   to the left of   10
50   15  to the right of    8
51   16         lying in   10
52   16          next to    4
53   16  to the right of    3
54   16  to the right of    4
55   16  to the right of    2
56   16  to the right of    9
57   16  to the right of   12
58   17  to the right of    7