Which color is the tennis ball that is in the top of the image?
The tennis ball is green.
   src        edge_attr  dst
0    0  to the right of   13
1    4  to the right of   11
2   10   to the left of   13
3   11   to the left of    4
4   13  to the right of   10
5   13          wearing    7
6   13          holding    0
7   13   to the left of    0