Is there any zebra or elephant in the picture?
Yes, there is an elephant.
    src        edge_attr  dst
0     1   to the left of   14
1     1   to the left of    2
2     2  to the right of   21
3     2  to the right of    1
4     2   to the left of    5
5     2   to the left of   14
6     3               on   17
7     3  to the right of   21
8     5  to the right of    2
9     5  to the right of   14
10    7   to the left of   10
11    8               on    4
12    8  to the right of    9
13    9               on    4
14    9   to the left of   11
15    9   to the left of    8
16   10   to the left of   11
17   10  to the right of    7
18   10               on    4
19   11  to the right of    9
20   11  to the right of   10
21   11               on    4
22   12               on    4
23   14  to the right of    2
24   14  to the right of    1
25   14   to the left of    5
26   14  to the right of   21
27   16  to the right of   21
28   17  to the right of   21
29   21   to the left of    2
30   21   to the left of    3
31   21   to the left of   16
32   21   to the left of   14
33   21   to the left of   17