What is the elephant walking on?
The elephant is walking on the dirt.
    src        edge_attr  dst
0     0  to the right of    7
1     0               of    6
2     2   to the left of    8
3     2   to the left of    4
4     2   to the left of    6
5     2   to the left of    5
6     4  to the right of    2
7     5               of    6
8     5  to the right of    2
9     6  to the right of    2
10    6       walking on    4
11    7   to the left of    0
12    8  to the right of    9
13    8  to the right of    2
14    9   to the left of    8