Are there dogs or cats?
Yes, there is a cat.
    src        edge_attr  dst
0     0   to the left of    3
1     0   to the left of    9
2     0   to the left of    2
3     0   to the left of    1
4     1               of    3
5     1   to the left of    9
6     1  to the right of    0
7     2  to the right of    8
8     2  to the right of    0
9     2  to the right of    4
10    3  to the right of    0
11    4   to the left of    2
12    4   to the left of    9
13    8   to the left of    2
14    8   to the left of    9
15    9  to the right of    0
16    9  to the right of    8
17    9  to the right of    4
18    9  to the right of    1
19    9  to the right of   10
20   10   to the left of    9