What's on the cake?
The star is on the cake.
   src        edge_attr  dst
0    0               on    6
1    0  to the right of    2
2    2  to the right of    3
3    2   to the left of    0
4    3   to the left of    2
5    4  to the right of    5
6    5   to the left of    4
7    5               on    6