Is the grass green or brown?
The grass is brown.
   src        edge_attr  dst
0    5  to the right of    9
1    7  to the right of   10
2    9   to the left of    5
3   10   to the left of    7
4   10   to the left of   11
5   11  to the right of   10
6   12   to the left of   14
7   13  to the right of   14
8   14   to the left of   13
9   14  to the right of   12