Is the pine to the left of a skier?
No, the pine is to the left of a moose.
   src        edge_attr  dst
0    0   to the left of    7
1    0  to the right of   10
2    4   to the left of    5
3    5  to the right of    4
4    5  to the right of   10
5    7  to the right of    0
6   10   to the left of    0
7   10   to the left of    5