On which side are the green pine trees?
The pine trees are on the left of the image.
   src        edge_attr  dst
0    0   on the side of    1
1    0   to the left of   10
2    3   to the left of    8
3    4  to the right of    7
4    7   to the left of    4
5    8  to the right of    3
6    8   to the left of    9
7    9  to the right of    8
8   10  to the right of    0
9   10               on    1