Which color do you think the napkin is?
The napkin is gray.
   src        edge_attr  dst
0    2               in    0
1    3  to the right of    6
2    3  to the right of    9
3    6  to the right of    9
4    6   to the left of    3
5    8               in    4
6    9   to the left of    3
7    9   to the left of    6