Are the planes on the left side or on the right?
The planes are on the left of the image.
    src        edge_attr  dst
0     0   to the left of    3
1     3  to the right of   12
2     3  to the right of    8
3     3  to the right of    4
4     3  to the right of    0
5     4   to the left of    3
6     6   to the left of   14
7     6   to the left of   10
8     6               of   12
9     8               of   12
10    8   to the left of    3
11    9               by   11
12    9               on   11
13   10  to the right of    6
14   10  to the right of   14
15   10               of   12
16   12               on   11
17   12   to the left of    3
18   14   to the left of   10
19   14  to the right of    6
20   15               of   12