Is there any elephant in the zoo?
Yes, there are elephants in the zoo.
    src        edge_attr  dst
0     0               of    9
1     0  to the right of    1
2     1               of    9
3     1   to the left of    0
4     2  to the right of   14
5     2  to the right of    5
6     2  to the right of   10
7     2  to the right of    9
8     3   to the left of   10
9     3  to the right of    7
10    3   to the left of   15
11    5               in    4
12    5   to the left of    2
13    6  to the right of    7
14    6   to the left of   10
15    7               of    9
16    7   to the left of    8
17    7   to the left of   10
18    7   to the left of   14
19    7  to the right of   17
20    7   to the left of    3
21    7   to the left of    6
22    8   to the left of   10
23    8  to the right of    7
24    9   to the left of    2
25    9   to the left of   11
26    9           eating    6
27   10   to the left of   15
28   10  to the right of    8
29   10               of    9
30   10  to the right of    6
31   10  to the right of    7
32   10  to the right of    3
33   10   to the left of    2
34   11  to the right of    9
35   14   to the left of    2
36   14  to the right of    7
37   15  to the right of    3
38   15  to the right of   10
39   17   to the left of    7