Are the snow flakes in the sky?
Yes, the snow flakes are in the sky.
   src        edge_attr  dst
0    0               of   10
1    1   to the left of    7
2    3               of    4
3    4          wearing    8
4    4               on   11
5    4        riding on   11
6    5               in   13
7    6       covered by    6
8    7  to the right of    1
9   12               of   10