Do you see either cups or bulbs there?
No, there are no cups or bulbs.
   src        edge_attr  dst
0    1  to the right of    5
1    1  to the right of    3
2    1  to the right of    2
3    2   to the left of    1
4    2  to the right of    5
5    3   to the left of    1
6    5   to the left of    1
7    5   to the left of    2