Is the gray elephant to the right or to the left of the fence?
The elephant is to the left of the fence.
    src        edge_attr  dst
0     0  to the right of   10
1     0  to the right of    7
2     1  to the right of   11
3     2   to the left of    3
4     2   to the left of    9
5     2   to the left of    5
6     3  to the right of   11
7     3  to the right of    2
8     5  to the right of    2
9     7   to the left of    0
10    9  to the right of    2
11   10   to the left of    0
12   11   to the left of    1
13   11   to the left of    3