Which is healthier, the cabbage or the cake?
The cabbage is healthier than the cake.
   src        edge_attr  dst
0    1  to the right of    8
1    3  to the right of    8
2    4  to the right of    8
3    7  to the right of    8
4    8   to the left of    1
5    8   to the left of    7
6    8   to the left of    3
7    8   to the left of    4
8    9          contain    4